There are a few things you can do to remove yellowing from white car paint. The first is to use a hairdryer on high heat to remove any built-up oils and sweat. This will also remove any dirt and dust that may have built up over time. The next step is to use a bucket of water and a cloth to clean the paint surface. Be sure not to get any water on the car’s interior, as this could cause further damage. Finally, use a vacuum cleaner with the hose attachment to suck up all of the dirt and debris that has built up on the paint surface.