I used some degreaser to clean my engine and it left a residue on my plenum and runners. This really suks. What do you all recommend using that wont leave a residue? Thanks.

 

When we clean aluminum at the shop here we are just using rubbing alcohol to remove any foreign substance. Anything else like blemishes can be sanded or polished out.

 

a nice lil cleaner for cleaning most stuff off from under the hood is castrol superclean or something like that.. comes in a purple spray bottle.. works pretty good...

 

I use grease lightening for everything. Best results for underhood and underbody are straight out of the bottle (not diluted).

 

I use the castrol superclean too. Just spray it on and scrub a little with your tool of choice. I dont have anything polished but I havent noticed a residue on anything in the engine bay. It works pretty good for tires and stuff too.

 

Simple green baby, you can use it for everything, even your grease spotted clothes in the wash!!

 

Yeah I like simple green alot.