glass cleaner
I use a white tile at the moment. Though in the past I\'ve used a white plastic plate, gw blisters, cd cases, the table. Really what ever was handy.
*BIG NOTE* A little trick I picked up while working at GW. If you spray dried gw paints with Glass Cleaner (ie:windex, or the cheap stuff that costs $1) and let it sit for a few minutes it will wrinkle and you can scrape it right off. I usually just push the back end of my scrap brush around.
It pulls the paint right off and you can wipe it with paper towel and viola. Sparkley white again.
(I don\'t know if it works for Vallejo or Master. If anyone tries let me know)