Imagine it is summertime... You are having guests for some light snack, some green salad with diced carrots, peas, wine, etc.
Once your guests are gone, before putting the dishes in the dishwasher you have to wash some leftovers off the plates. You do it in the sink.
And now... Here comes my cleaning sponge ! You have those leftovers in your sink, all that accumulated stuff, like diced carrots, peas, etc.
So you put the sponge's cavity on the top of that mess and gently push it to the sink hole. Assuming you have a garbage disposal installed.
This way you don't smash one of those peas or carrots by accident. Repeat this over and over again...
And now your sink is clean! My sponge comes handy...
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And here is what Enot1 got from 'InventHelp Inc'.