The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 09-24-2017, 01:46 AM   #1
BigRandy
Registered User
 
BigRandy's Avatar
 
Join Date: Jun 2017
Location: Alexandria, Louisiana
Posts: 26
What to use to clean years of mold off the paint

So my 74 has been neglected for what looks like decades. The paint is shot and it looks like the clear coat is coming off.

I'm not too worried about being delicate with a good wash. There's black mold or tree spots on the cab. What can I use to scrub it down to the paint. Dish soap? Tied powder if they still sell it? I've even considered Comet in a can and rubbing it off.

It used to be white but now it's mostly a yellow off-white.

What do you guys and gals use when you bring home a rusty, faded old truck?

Thanks
BigRandy is offline   Reply With Quote
Old 09-24-2017, 08:31 AM   #2
TKCR
Senior Member
 
TKCR's Avatar
 
Join Date: Oct 2014
Location: Ohio
Posts: 2,519
Re: What to use to clean years of mold off the paint

This is what I do, when I detail a car or truck. Wash the vehicle with Dawn and while it is good and soapy, use a good clay bar on the surface. The clay bar works best when its wet & soapy. The clay bar will take most, if not all the contaminants off the paint.
Next would be polish, polish, polish. There are a lot of good 3 step polishes out there. There have been a few members that have posted their success, try doing a search. You can also search some YouTube videos on this subject also.
TKCR is offline   Reply With Quote
Old 09-24-2017, 08:57 AM   #3
67swb72klb
Registered User
 
67swb72klb's Avatar
 
Join Date: Dec 2010
Location: livingston co.mi
Posts: 1,918
Re: What to use to clean years of mold off the paint

The Comet and a car wash brush works good for me to get most of it off...
__________________
California 65 GTO---Texas 64 burb 283 ---Oklahoma 67 CST SWB BBW wood bed 327 2004r---New Mexico 72 k10 350 350 auto---Georga 72 short step project
67swb72klb is offline   Reply With Quote
Old 09-24-2017, 10:18 AM   #4
mongocanfly
Senior Member
 
Join Date: May 2015
Location: alabama
Posts: 4,145
Re: What to use to clean years of mold off the paint

if your not at all worried about the paint... wash it with abrasive soap ^^^(comet)^^^...then wet sand the whole truck and then buff it..if your not worried about the paint then you've got nothing to loose...
mongocanfly is offline   Reply With Quote
Old 09-24-2017, 11:33 AM   #5
BigRandy
Registered User
 
BigRandy's Avatar
 
Join Date: Jun 2017
Location: Alexandria, Louisiana
Posts: 26
Re: What to use to clean years of mold off the paint

I have clay but the paint on this old truck would likely rip a clay bar to pieces. I can't think of anything that won't require a ton of elbow grease. Comet may be the answer. I'll try laundry detergent and maybe some Simple Green and go from there. Was just curious to see if anyone knew of a simple solution to get the mold and crud off the paint.

The paint code says it's white. I had a frost white 77 once and maybe somewhere under the crud it's here too, but right now it's not even close.

Thanks a bunch!
BigRandy is offline   Reply With Quote
Old 09-24-2017, 11:55 AM   #6
Leonard60
Registered User
 
Join Date: Jun 2016
Location: Leslieville alberta
Posts: 240
Re: What to use to clean years of mold off the paint

Try some oven cleaner (sodium hydroxide) also known as lye. I've used this product a lot works very well. Be carful it burn like a ***** if you get it on your bare skin.
Leonard60 is offline   Reply With Quote
Old 09-24-2017, 11:57 AM   #7
mongocanfly
Senior Member
 
Join Date: May 2015
Location: alabama
Posts: 4,145
Re: What to use to clean years of mold off the paint

never tried this but I wonder if clorox and hot water would work on it...
buddy of mine uses it on his vinyl siding and it looks new when he gets done...
mongocanfly is offline   Reply With Quote
Old 09-24-2017, 02:56 PM   #8
SKT
Registered User
 
SKT's Avatar
 
Join Date: Oct 2014
Location: Location:
Posts: 840
Re: What to use to clean years of mold off the paint

.

Let's see some pics of this truck.

I'd use CLR.

See this link:

http://67-72chevytrucks.com/vboard/s...d.php?t=447159

.
SKT is offline   Reply With Quote
Old 09-25-2017, 07:13 AM   #9
cadillac_al
Registered User
 
Join Date: Oct 2013
Location: Maine
Posts: 1,426
Re: What to use to clean years of mold off the paint

Pressure washer.
__________________
76 Chevy K20
76 GMC K15
77 Chevy C10
cadillac_al is offline   Reply With Quote
Old 09-25-2017, 11:12 AM   #10
Dead Parrot
Registered User
 
Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 779
Re: What to use to clean years of mold off the paint

Try just soap and warm water first with a scrub pad. Not all tree sap is as permanent as elm tree sap. The black could be mold or rubber/carbon from a nearby highway. A lot of times, that old original paint will buff up nice. Not sure how much clear coat was used in 74.

If you start with industrial strength cleaners and/or abrasives and it turns out the black is just decades of dirt and grim, you might wind up damaging what was a salvageable paint job.
Dead Parrot is offline   Reply With Quote
Old 09-25-2017, 03:46 PM   #11
75C10
Registered User
 
Join Date: Oct 2014
Location: Calgary Alberta
Posts: 82
Re: What to use to clean years of mold off the paint

Pressure washer. Just did this with old paint covered in sap, bird poop etc. Came out amazing
75C10 is offline   Reply With Quote
Old 09-25-2017, 03:57 PM   #12
Desert_Eagle02
Registered User
 
Join Date: May 2017
Location: Texas
Posts: 161
Re: What to use to clean years of mold off the paint

I'd try just plain car wash soap and warm water. My truck was covered in years of grime, tree sap and probably mold when I got it. I just used some soap and water and it turned out great. Nice bright shiny paint underneath.
__________________
1978 GMC K25
Desert_Eagle02 is offline   Reply With Quote
Old 09-25-2017, 04:45 PM   #13
Honest Bob
Registered User
 
Join Date: Jan 2017
Location: Easton PA
Posts: 24
Re: What to use to clean years of mold off the paint

I got the green fuzz off of mine with a pressure washer and straight water.
Honest Bob is offline   Reply With Quote
Old 09-25-2017, 05:17 PM   #14
RotaryRocketeer
Registered User
 
RotaryRocketeer's Avatar
 
Join Date: Jul 2017
Location: OKC, OK
Posts: 104
Re: What to use to clean years of mold off the paint

Car wash mitt or microfiber sponge with soap has never failed to shine up any field car I've purchased. Takes some scrubbin' and sweatin' though.
RotaryRocketeer is offline   Reply With Quote
Old 09-25-2017, 05:34 PM   #15
Desert_Eagle02
Registered User
 
Join Date: May 2017
Location: Texas
Posts: 161
Re: What to use to clean years of mold off the paint

Quote:
Originally Posted by RotaryRocketeer View Post
Car wash mitt or microfiber sponge with soap has never failed to shine up any field car I've purchased. Takes some scrubbin' and sweatin' though.
It for sure does take some scrubbing and sweating lol. I had grime and probably mold on the underside of the hood too. That was a pain. If I were to do it again, I'd just take the hood off lol.
__________________
1978 GMC K25
Desert_Eagle02 is offline   Reply With Quote
Old 09-25-2017, 09:41 PM   #16
RedBed
Registered User
 
RedBed's Avatar
 
Join Date: Apr 2017
Location: TX
Posts: 52
Re: What to use to clean years of mold off the paint

I had the same problem with an old white truck. Went to the car wash, but before I entered the bay, I sprayed it with Krud Kutter and let it soak for 10 or so minutes. Came right off with the sprayer.
__________________
1979 Chevrolet Bonanza / 305 / 4L60
RedBed is offline   Reply With Quote
Old 09-26-2017, 07:54 AM   #17
mgreene
Registered User
 
Join Date: Jun 2017
Location: aiken, sc
Posts: 13
Re: What to use to clean years of mold off the paint

I had some kind of rotted vegetable matter fused to the paint of my 87 - little black curly-cues - all over the hood and top. I tried soaking and washing and bug remover, etc.

I ended up using a magic eraser - it worked great with no damage to the (AFAIK) single stage paint.

Some body guys say the magic eraser is like 3000 grit sandpaper; some say it is more like 1500 - but in any case, I didnt use great care - it just worked. If you paint is already pretty ratty, you dont have much to loose.
mgreene is offline   Reply With Quote
Old 09-26-2017, 09:01 AM   #18
DBLSPRT68
Registered User
 
DBLSPRT68's Avatar
 
Join Date: Nov 2000
Location: Ft. Mill, SC USA
Posts: 929
Re: What to use to clean years of mold off the paint

I just cleaned a under tree find myself. I used Purple Power cleaner with a little water and a wash brush. It came out really well. Paint is shot so wasn't worried about that, just wanted it clean.
__________________
NEW TRUCK: 1985 SWB C10 Silverado Black/Charcoal,1990 V2500 Suburban, 2003 Yukon XL (My DD), 2005 GMC 2500HD CCSB, 2014 Toyota Camry SE (Hers), 1968 Camaro RS/SS Family owned since new; 350 3 speed SOLD
DBLSPRT68 is offline   Reply With Quote
Old 09-26-2017, 05:44 PM   #19
4x4k30
Registered User
 
4x4k30's Avatar
 
Join Date: Jun 2003
Location: ga
Posts: 405
Re: What to use to clean years of mold off the paint

I use regular bleach put in on dry not wet panels and wash of with hose don't do it in your new clothes and shoes
__________________
4x4k30 if trouble was money i would have plenty
4x4k30 is offline   Reply With Quote
Old 09-26-2017, 05:54 PM   #20
Flying Hamster
Registered User
 
Flying Hamster's Avatar
 
Join Date: Aug 2015
Location: Starbase 4
Posts: 102
Re: What to use to clean years of mold off the paint

vinegar
__________________
2006 Sierra RCSB V6 5 Speed RWD.
Flying Hamster is offline   Reply With Quote
Old 09-30-2017, 04:19 PM   #21
LT7A
Registered User
 
Join Date: Oct 2015
Location: Seattle, WA
Posts: 493
Re: What to use to clean years of mold off the paint

Lots of ideas here. I'll make a couple of assumptions:

You'd like to clean it up to a usable condition, no immediate plans for paint or to part it out.

You will be doing work on other parts of it since it has been sitting so long.

With those in mind, I would use any standard car wash soap, mix it strong, and use a gentle car wash brush. The soap is mild but won't pull oils from the paint that you want to keep (whatever remains). The mold and other surface materials may actually have helped preserve the paint so you want to remove them gently. The brush is a stronger way to agitate the soap into the deposits than a sponge, mitt, or microfiber so it shouldn't be used on good paint where swirl marks matter but will be an ally here. The brush also speeds up the process since it increases your reach. Use a bucket for soap/water and a separate one to rinse in.

Since it will go fast with the brush, just do it multiple times. I assumed that you are doing other things to the truck so each day you wrap up the work, soap it down and rinse it off. I got it down to a 10 minute process when I had to wash my truck weekly. The paint will look a little better each time and no real elbow grease involved. After a few washings, you can use straight car wash soap on a sponge for stubborn places.

Once it is fairly clean, a coat of cleaner wax will protect it and give you a good idea of what you're working with. Then you can decide if you want to get all detail-master on it with clay bar, compounds, etc. Might yield great results or might have diminishing returns. Once the paint is clean you can figure out what's worthwhile.

If you don't expect the first round to get it all clean, but wash it a few times, you'll preserve whatever is left of the paint. There are quicker methods but they all can impact the paint (he says from experience).

Good luck. Show us some before, during, after pics. Thanks!

Last edited by LT7A; 10-01-2017 at 02:10 PM.
LT7A is offline   Reply With Quote
Old 09-30-2017, 04:41 PM   #22
SKT
Registered User
 
SKT's Avatar
 
Join Date: Oct 2014
Location: Location:
Posts: 840
Re: What to use to clean years of mold off the paint

.
.

Seriously...

.
.
SKT is offline   Reply With Quote
Old 10-01-2017, 02:46 PM   #23
LT7A
Registered User
 
Join Date: Oct 2015
Location: Seattle, WA
Posts: 493
Re: What to use to clean years of mold off the paint

Quote:
Originally Posted by SKT View Post
.
.

Seriously...

.
.
Worthless? Not really. Many of us have seen moss on a truck. Pics would help tho.

Last edited by LT7A; 10-01-2017 at 03:00 PM.
LT7A is offline   Reply With Quote
Old 10-02-2017, 03:32 PM   #24
RADustin
Junior Member
 
Join Date: Jun 2017
Location: New Orleans
Posts: 61
Re: What to use to clean years of mold off the paint

pressure washer works great. and doesn't strip paint like you'd think.

I even use one of those whirly nozzles that clean the crap out of concrete. cleans up old paint great.
RADustin is offline   Reply With Quote
Old 10-02-2017, 09:05 PM   #25
SKT
Registered User
 
SKT's Avatar
 
Join Date: Oct 2014
Location: Location:
Posts: 840
Re: What to use to clean years of mold off the paint

Name:  IMG_4845.JPG
Views: 130
Size:  68.7 KB

Name:  IMG_4846.JPG
Views: 130
Size:  68.5 KB

Name:  IMG_4847.JPG
Views: 130
Size:  63.5 KB

Name:  IMG_4818.JPG
Views: 129
Size:  49.2 KB

Name:  IMG_4817.JPG
Views: 129
Size:  51.3 KB
SKT is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 04:14 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 1997-2013 67-72chevytrucks.com