"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.

Bob Stevens
'87 Syncro Westy

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