I noticed at the store the other day that the peroxide mouthwash products are 1.5% rather than 3% and all advise spitting the product out.
Also it is thought (according to google) that oxidizing mouthwashes like those with peroxide may contribute to Hairy Tongue syndrome. I would hate to end up with a case of Hairy Stoma...
And this is a pic of a peroxide bottle that talks about
diluting it for oral debriding
http://images.ddccdn.com/otc/103705/label.jpg
and I would not want to debrid my stoma anyway since it is the removal of dead, damaged, or infected tissue.
So I think I will stand on my recommendation of NOT using peroxide but of course people are welcome to do as they please...doesn't bother me a bit.