I just got some of the Malco Plastic and Leather Cleaner, and I agree that it is great. I had some deep dirt in the little vinyl dimples. I tried vineger, Fantastic, and soapy water. The Malco stuff worked ten times better. I will say the stuff is hard to find. You HAVE to call the company number to find out where you can get some. In my area, it was only sold by a road rep. He delivered a gallon to my door for $15. The best $15 I have spent on boat care products yet.