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Old 06-29-2020, 09:52 PM   #3
travelin texans
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Join Date: Nov 2017
Location: Picacho, Az
Posts: 6,809
A good squirt of dish of laundry soap with a couple gallons of water added to the tank after dumping works as good as any of the chemicals.
The best advice for the black tank is use plenty of water per flush.
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