Do I ever need to clean my cooler when I use Cooler Guard? Yes, you should drain your sump and rinse it out thoroughly before each use of Cooler Guard. By admin|February 5th, 2018|Cooler Guard|Comments Off on Do I ever need to clean my cooler when I use Cooler Guard? Share This Story, Choose Your Platform! FacebookXRedditLinkedInTumblrPinterestVkEmail About the Author: admin