Oh forgot... Get this stuff called ZEP. It works great! Also before you polish parts you can spray it on the metal and it will turn the metal all white, etc and will pull ALL that black outta it and then after it's done with it's job you wash it off, dry it and polish it up real nice. I use it on my engine all the time and it works good. It won't get the 10 year old baked on greese oil or grime off but everything fresh and all the mud, dirt, etc. I got a huge bottle of this stuff and then a spray bottle of it too. Great on rims before you polish them to pull that black out. I did this to the metal around my tail lights and when all the black stuff was out of the metal I could see that the metal was actually galvanized aluminum or whatever because you can see the little patterns in the metal, after that I polished that badboy up and it was like a mirror.