Although I would love to give you a positive suggestion to your issue, I find myself thinking that you have done a LOT and was not successful. I would have been the first to suggest APC however you tried bleach already which is highly alkaline (pH 12) which is equal to straight APC, so I am at a lost to offer a suggestion. You've used mild detergents, heavier detergent with dish soap, and have even used bleach..... Dunno brother!