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Similar to the Dawn dishwasher liquid technique I make a point of on the black tank dump before a travel day I have the black tank flush water running and then I close the black tank valve and let water run for ~20 seconds to fill the black tank with a gallon or two of water... Then I go inside to the bathroom where I keep a tub of citrus dishwasher tabs - I throw a tab down the toilet... Then on the drive the soapy water can slosh around giving it a good rinse... The same can be done with the galley/shower tanks by dropping a citrus dishwasher tab in the sink and let the water run til the tab dissolves...
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