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I agree with the other posters. No special treatment is needed for your sewer hoses. Dump the black tank first, then the grey tank(s), then rinse it out with a bit with water using the separate, dedicated black tank flush hose. My Camco RhinoFlex hoses all have caps to put on each end so they don't drip into the Rubbermaid lockable bin I use for all the sewer stuff. When I get back home, I usually take them out of the bin, remove the caps and stretch them out fully to dry, and then pack them back in the Rubbermaid bin.