I'll have to try this. Especially on my tailpipe also. Just straight vinegar?

 

Yep, just pour it into a spray bottle. You won't know how to react... amazed how easy it is, or pissed off you spent so much time trying to get the crud off before!

 

As soon as mine gets back from the custom shop (new Carli lift, rims and tires), it's going to Linex to get the running boards sand blasted coated. They don't pull the plastic off, just hit the whole thing. Can't wait to not have to was between those darn plastic pieces anymore.