how do you repair / clean / fix the center caps of the stock wheels of my NX2000? Mine are all faded and yellow?

mine were all yellow too, i just got some silver spray paint and sprayed them, quick fix, and it looks better than yellow, and the paint is still on there

i had that problem, i used dutch boy instant chrome and it was a pretty decent match... but when i washed the car the paint would keep coming off... so now i just took the center caps off :D