any extreme cleaning agent to use before painting rims?, after sanding them down.... Options

[daazndood]

hey guys. so im in the process of sanding down my rims in order to prep it up to paint. im having a problem getting all the dirt and grim and tar off of it especially in the back.

for the most part i have it completely cleaned, but some parts i couldnt get off i ended up just sanding it anyways and that seemed to get it off pretty good. but im still just a little worried.

is there any super-strong cleaning agent that will completely destroy any amount of dirt left on it? i want the paint to stick as long as possible.