These washing machine cleaner tablets do a great job of keeping my washer clean and fresh with very little effort. I usually use one every two weeks to about once a month, depending on how often I run the machine and how dirty the loads are. I place a tablet directly in the bottom of the drum and run the washer’s self-cleaning cycle. The tablets dissolve well and don’t leave behind any residue. After each use, the washing machine smells clean and fresh, and there’s a noticeable reduction in built-up dirt and grime. I’ve been using them in my HE top-load washer, and they compare very well to other washing machine cleaners I’ve tried.