re: Chrome cleaning

I just had some diecast custom chrome work done and asked the plater what I should use to clean it and he said just use windex. Chrome diecast pits from underneath the chrome. I guess if you have some pitting, then you'll probably have to use some chrome polish. I asked if there was something that I should put on to protect the chrome (eg. wax?), he said chrome plating is one of the hardest substances made. Obviously, there are different levels/qualities of chrome plating.