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No to the tank sprayer/cleaner. It only affects the black tank. You don't want to add more liquid when there is no way for it to escape assuming all three tanks are not draining.
Close the black tank valve. remove the sewer hose and run a hose up the line with the galley (or shower) valve open to check for an obstruction.
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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