I err on the side of thoroughness, but I use so much more time & water than others I see. I think I’m doing a better job… does it matter?
I want to watch an in-depth video of the minimum required washing. If you know or are a science educator (microbiologist? Epidemiologist?), maybe you can help :D
Soap. Start with the rough side of the sponge to get the big bits off, then the other side to finish it off. Dry with a clean towel.
Or toss ‘em in the dishwasher.
periodically microwave the sponge, they are bacteria farms.
Replace with cotton cloths, sponges are also micro plastic farms, and the cotton cloths can be boiled/washed on high and reused.