Check out this method. I actually looked into this a while ago when living in an apartment. The unit is cordless and all you do is fill up the reservoir. As you can see the foam is pretty thick using a foam gun. Two buckets for paint and one for wheel is ideal. But if getting job done quick is important, all you need is one prefilled bucket with a dolly and grit guard underneath for paint. For wheels, hit it with adams wheel and tire cleaner and spray off wheel/tire brush as needed. Might want to bring an extra gallon of water. Easily done in an underground garage.
portable pressure washer :
https://www.amazon.com/Karcher-11171...cher+follow+me