Best tip I can toss into this mix, at this point, and for the stone hard core fanatical is to use DI water for whatever your brew of choice is.
High Calcium Carbonate water, in synch with ANY of the suggested surfactant / solutions suggested will in no way help.
Don't let your gals see ya' pouring the used solution on the flower bed / vegetable garden / Roses, either.
Maurer's stuff just flat out ROCKS Tomatoes and Cucumbers.
SHHHhhh...
GTC