Hi,
I'm not sure if I'm doing it 100% correctly, but once I stamp the image, I use a soft bristle toothbrush with some dishwashing detergent (tiny amount) and clean it off well. I then use the Stampin' Mist and Scrub Pad to clean it again (I believe the mist keeps it from drying out).
Hopefully people with more bleaching experience can let us know if there is a better way, but so far, this has worked for me !!
HTH,
Myra