Re: No definitive way to remove yellow/brown stains from inlays?(ie PCA)
On a ~single~ severely stained chip, I'd try an overnight soak in a mild bleach solution (20% Clorox, 80% hot tap water). Mild agitation would be beneficial, as it is more likely to seep under the inlay if the solution is moving around some. Follow that up with a neutralizer soak (another 24 hours), then let it dry (standing upright) for a week or so, with plenty of air circulation. The object is to actually impregnate the inlay with solution, have it whiten the inlay while impregnated, then thoroughly rinse and dry it out.
Might work, might not. Dunno what it will do to the edge spot colors, or to the inlay's printed ink. But it's probably worth a try to me, since I personally wouldn't be using any chips that were that stained anyway.
Use gloves and eye protection, and keep the stuff away from the kiddies and pets. Good luck.