John,
I wasn't saying you weren't the best, I was just asking why can't you offer a solution for this problem, if the customer is willing to add more money ?, I get it that you have limited control of what the factory does, but you can still hire someone to do it manually for people who are willing to add more money, isn't this possible ?

I prefer to pay some extra money in advance for someone to completely bleach my piece, instead of risking the entire piece with my unskilled hands.