You will have to use a external container (such as a bucket) and then you would set your valves to the sanitize position (which allows you to suck in a through a short piece of hose via your pump from your bucket) and that should work.
Look in your manual for the instructions on how to sanitize your on-board tank.
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2009 F350 CC LB 4WD
2017 Jayco 355MBQS
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