Hi all, im new to the forum. I just bought an 07 G6 3.5L sedan (see my avatar). I have a couple of questions about cleaning up my car. first, my plastic engine cover has some weird white stains on it (see pic below). I tried dish soap and a brush, but it didnt help at all. Secondly, the previous owner was a smoker and the interior is rancid. im planing in washing and vacuuming it thoroughly, but i know smoke hangs around for a while. Anyone have any suggestions for drawing out the rest of the stench? thanks!