My mustang had been stashed in the corner for nearly 30 years. When I finally got that thing out this year first thing I had to do was clean it all up, including the bottom side.
The entire underside was infested with black widows and egg sacks.
I knew I had a few as I would see one every once in a great while in or around the shop. Well I found their hiding place
Strangly enough they were just concentrated there and no where else in the shop so they were fairly easy to get rid of.
I found that getting out the power washer and blowing off the entire bottom of the car pretty much blew those things out of there