cry
Glaze off walls???? You don't. you prime and apply fresh paint.
Mr clean sponge
Mr. Clean Magic Eraser, it might take off some wall paint... you can find them at Walmart or Target.
Clean it!
You can decorate with fabric paint on fake patent shoes. Most store like Waltmart, Zellers etc... have a section on fabric paint, it comes in tube or bottle and once dried it will not come off.
You can't without destroying the cardboard.
Water based paint will do that
Primers are not water proofers, in fact primers can't be left as the finish coat because they have no durability. If the paint acts as a primer how can you expect the paint to stand up as a true finish coat.
Because fabric paint is made specifically to stick to clothing, it can be difficult to remove from fabric. A few things which help remove it are rubbing alcohol, hair spray, and hand sanitizer.
You need to do proper preparation BEFORE you paint the walls. This will include removing all grease and striping off old paint. Then paining the walls with primer and or undercoat before applying the topcoat. The paint tin instructions will detail what you have to do.
Rub it with a rag dipped in Goof Off. -It will NOT harm the car paint.