A friend was told this by a Jayco mechanic. At the end of the season when you want to clean out your black tank . Dump a big bag of ice cubes before traveling it will swish around while moving and remove stubborn remnants. When you get to the camp ground dump the melted ice. I use mine for hunting late season so I will try this , just thought I would share.
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2010 F-150 Supercrew 4X4 5.4L 3.55:1
LT22BH EQ2 Tekonsha Prodigy P2
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