I'd empty it and use the flush to flush everything out.
While the manual says that the valve must be OPEN when using the flush, I do close it to allow the tank to fill with water to force flush everything when the valve is opened. This is NOT recommended by Jayco, but I only fill it for a minute or so then pull the valve.
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Karl - Southeast, NY
2020 377 RLBH
2018 Ram 3500 Mega Limited 6.7L Cummins w/ Aisin
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