Bill, typically once is sufficient. The amount and strength of the adhesive determines how long it will need to soak. I know there was a disagreement on this, but my experience is that warm water works faster and better. I do recommend a final rinse/soak however, in clean water to remove any last little bits of stickiness (much like draining the tub of dirty water and giving yourself a final rinse if you were taking a bath after working in the yard).
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