Cleaning car exterior (tar?)

@Bing‌
Once a year, I open up the cab door and hose the interior down…check, once every year and a half. I have to get on a step ladder to dump diesel into the filler on top of the hood. I do this by standing with one foot on the hood, and in the winter with my Ice grippers still on. Needless to say, no waxing would help.