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Until now, I never had a good way to clean out a portable evaporitive cooler before puting it away for the season. Yes, drying it out is a good thing to do, but water stays trapped in the pump, tubing and other places and often gets moldy before the next year. This seems to do the trick. Don't get the RTU (ready to use) version for this particular use, because it is diluted. This one will get diluted when you mix it with water for the cooler.