What do you use to clean the underside of your race car?

[Henrys Toy]

Originally Posted by Keith 944

Believe it or not wd-40 works pretty well and won’t damage anything

I have had good success with WD40 and it will lube the Heim Joints as well.
I also have had good success with the Purple Clean from most Auto Parts stores and Hardware stores. I've safely used it on Alum. parts but once the area is clean rinse with alot of water. It might dull polished Alum. surfaces, just be fore warned, but it'll be clean.