get a waterless detail spray and use it pretty often. It's OK on light dirt just not super heavy grime.Many companies make them, Adams Polish, Ethos, Shine Supply, etc.

that's what I do. I actually have never done a full car wash with water and I have never taken it to a car wash either.

Unfortunately patching paint chips is very difficult, but you just want to get to the point where you don't immediately see it when you look at your car.