By week 2, my husband had bad mouth sores, so we knew he needed to figure out the mouth washes, quickly. He found the decision of which of the many recommended mouthwash regimes to use one of the more perplexing decisions. What helped him make the decision was to break it down by purpose. Here's what he used, and in this order;

1. 1:3 hydrogen peroxide & water solution, to try to heal existing sores
2. Magic/Pink wash, for symptom relief
3. Mugard, preventative (he swalled some of this to coat throat too)
4. Caphasol Artifical Salivia, also preventative, to keep the mouth moist

Within one week of using this combination, he was down to one mouth sore, which he was able to "eat around" using viscious lidocaine dabbed on that one spot. He continued to use this throughout treatment, and the mouthsores never returned.

On a side note, Mugard is extremely expensive, $1300/mo if memory serves. If your insurance will not cover it, they will send it to you for free. U of Chicago started recommending it last spring after Rush & Northwestern reported great results with it. It tastes nasty, and it's "one more thing to do", but considering the results, it was worth it for my husband.