*jmpet626: for heavy stains and lots of gunk and grease, i recommend Simple Green Max, but be careful with this one, you still have to dilute this and on stronger dilution ratio's it might whiten the rubber, but nothing a protectant couldn't restore, for light engine detailing and a much safer alternative, Simple Green Degreaser, the orange one, dilute it 1:4 up to 1:6 and the use as my BF taught you to, he mentioned you were planning on detailing a jazz? for that i would suggest you get some brushes with long handles, try to find the soft ones used for cleaning silver wares and vases, these are soft enough to not scratch the plastic but sturdy enough to remove the majority of grime, kinda hard to look for though