Periodically, I will add Dawn to the black tank after dumping and cleaning well. Then about 10 gal water + Dawn or Cascade pods added, then the sloshing from travel will tend to clean more with the detergent. There are all kinds of thoughts about how to clean it, some are better than others, some not. Sometimes I add Pine-sol before travel instead of Dawn. Working good for me, tank stays pretty clean, smell-free.
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2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired
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