The notable thing I come up with is that crusty blue lid you're using for your rinseless bucket... I bet it's twice as bad on the inside isn't it? And you wonder why the sponge winds up getting dirty on its own.. Lol. Just kidding man.
Well it looks legit. Thanks for the update. I wonder how Megs D114 would fare on keeping the sponge clean since it does really well keeping microfiber towels from staining and superb at releasing dirt. That's a funky looking sponge.. I suppose it's well engineered and works well, but it sure doesn't look like it'd be the safest thing to use.
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That blue lid is actually a bucket of masonry "anti freeze", I use 114 to clean the sponge from time to time actually. Just mix a half gallon and let it soak, comes out spotless.