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[Wheeliegirl]

 I'd try the bleach.  Hope you find a solution.

[mkcdaisy]

 I really don't have a suggestion but my older cat (13) just peed where the litter box normally is while I was cleaning out the litter. I am so MAD! I used the spot bot (with Pet cleaner) to get it the best i could since it ended up at the base board.  GRRRRRR