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Many of us do as Tom stated by dumping the black tank first then the galley tank and then the final shower/bathroom sink/s tank. I use the black tank flush several times after dumping the black tank while flushing it by closing the valve and letting the black tank fill part-way then open the dump valve, dump the flushed water and repeat again. I then dump the galley tank with the soapy dish water to clean the hose and them dump the shower/bathroom tank to gush/flush the hose even more and cleaning it even better.
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