finally, i got yellow stains from my test pipe
 

Previously, I asked what you guys use to get the yellow stains off a white car. The forum recommended scratch x or the simple green stuff.... so what do I do, wash my car and apply these to the stains? And you can purchase these at autozone correct? Any help, mych appreciated.

I got those too, I give up clean them everytime i wash the car. I hope they will turn dark after a while.

Meguires ScratchX works great with a nice microfiber towel. Any other scratch remover or polish should work though.

Simple Green Auto Cleaner works too but I opt for scratchX or I just scrub the area really good when I wash the car

I'd go with Scratch X before Simple Green. But Simple Green really kicks as s on just about everything