I agree with Ron. I have an ileostomy, and Hollister M9 drops work the best for me. You can buy them cheaper on eBay, if you don't have insurance.
I've tried 3% hydrogen peroxide, but the bubbles it produces makes my pouch blow up like a balloon, and mouthwash just made the output smell like minty poo, which is just wrong!
Hope that helps!
Dx'd Crohn's in '99 at age 28. Proctocolectomy and permanent ileostomy in '06.
Disease-free and medicine-free since surgery and very thankful to be healthy again.