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Like Jackhoar, I had great success with plain carbonated water. I used the Safeway Seltzer cans. They were cheaper than club soda and the cans kept the fizz while the big bottles were worthless once I opened them.
I avoided a PEG the first time around because the Seltzer was so effective in not only removing the mucous but also cleaning out the mouth sores (mucositis) and I alternated a swig of Ensure with a swish of selzter so i could keep swallowing. It helped with the dry mouth and you can just type seltzer in the search box to see prior posts of mine and others who swear by Seltzer water for mucous.
Charm