I would not put harsh chemicals into the shower drain. They could easily damage the seals on the holding tank. Fixing one problem and causing another is not a good plan.
I have never had a problem with any drains on my trailers and have taken thousands of showers over the years. Do you have any idea what is causing the blockage? Is it possible that the grey water tank is full and the water is simply backed up into the shower?
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Richard
Wally Byam Airstream Club 7513
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