Are you serious?
http://www.psacard.com/Services/PSAGradingStandards/
"N-7 Evidence of Cleaning - When a whitener is used to whiten borders or a solution is used to remove
wax, candy, gum or tobacco stains."
http://www.sgccard.com/grading_scale.htm
"Bleached: Generic term for the chemical process of cleaning or removing
stains or dirt."