"What concentration of vinegar is needed to act as a disinfectant?"

"I use a cup in about 8-10 gallons in the water tank. Let it stay there a
day or two while I drive it around, then, with the engine running, run a
half gallon thru the faucet and let it drain in the sink. Cleans the sink
and drain as well."

And, actually the part that I believe does the best job is that I let it dry
out completely between uses.

Bob

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