A sandblaster or sanding disc
If you have a newer car with an upscale paint job, be very careful before trying to remove any paint splashes. You can't tell if paint is truly latex without doing an acetone test. Try clay bar gently
Condition the upholstery and tires, put some fuel stabilizer in, remove the battery, wax the paint, cover the car.
One way to do it is to using an alcohol soaked cloth to soften up the latex paint. Use a plastic scraper to get the excess paint off after it has softened, ( never a metal scraper as it will scratch the paint) and work in small areas at a time. Remove residue left with a soft cloth soaked in the alcohol. This will also remove the wax underneath but should not be strong enough to damage the topcoat. Wash car and re wax. This is also a trick for finding out whether a paint on a wall is latex or oil base. Alcohol will soften latex but will not effect an oil base product It depends on how much there is. small spatters can be removed with Turtle #7 Compounding polish. Ammonia may also remove it. I have yet to see alcohol do anything to latex paint and I have been painting for 35 years.
how can you remove walnut stains from your car paint with out hurting your paint on your car
I don't think it is possible to remove that, sorry.
Sure, you can fingerpaint it with watercolors if you want to. Won't stick, though.
Try olive oil on a piece of paper towel. Don't scrub too hard or the leather dye could come off
One could get some effective car upholstery in local car upholstery retailers, such as Auto Depot, Hacksville car upholstery, Stickley, Audi & Co, and other companies.
Yeah, as long as you don't care what the car looks like. Use a fine finish tip for best results. An HVLP would be better though. Any home-use paint sprayer I have seen is for Latex paint (water base). Look for a latex paint for metal, use a primer and it should work.
Paint thinner cannot permanently damage the paint but it may remove the wax. It can be used to remove bug splats and tar. Lacquer thinner will remove the paint and the primer.