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First there is no drain off. The washing was temporary IE I ran through 35 or so gallons of gasoline washing (so less than 3.5 gallons of ethanol) I was prepared to take it to my local gas station to put in his waste tank but the water company said its perfectly ok to dump it down the drain. so thats exactly what I did. (it asked and answered many times)
if I were to do this long term I would look into a way of salvaging the ethanol as it should make a good stove fuel.
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