Since its winter and car washing is an little less frequent, and road grime spends more time sticking to the paint and it's a pita to just wash off. I came up with a solution....hose truck down, spray purple power from belt line down (I use a 2 gallon tank sprayer) then wash like you normally do with your favorite soap (I use zep-o-shine) and there isnt any grime left. It's so clean it's like I did a pre-wax and smooth as silk. I could literally wax it and skip the prewax. Has anyone had same luck as me?