we've found, in all our 85,000 miles of travel, sometimes days between dumping, while on the road, is that Dawn or similar dishwashing liquid is a very simple way to not only help 'clean' the tanks, especially as they are sloshed around while driving, but it also helps manage odors that may pop up from time to time. Most of us don't mind the 'odor' of dishwashing liquid, especially versus the other option.
I just add a few squirts at some point each day, into the toilet, and of course the gray tank already gets some as we wash dishes.
After dumping, we also run the toilet and the kitchen sink and add some right before we head out, as the roof vents and open windows, can 'vacuum' smells from the tanks if the p-traps have been siphoned out of water when the dumping happens. The filling of the p-traps in each drain after dumping is a great way to minimize smells. Sometimes we don't realize the amount of water being dumped, which can quite easily vacuum the small amount of water in the p-traps in a quick second.
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the Turners...
two Campers, two Electric cars
former diesel pusher traveler
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