Fact: 

While wanting to use natural cleaners is admirable, all of them will damage your disposal and pipes over time.

The lemon’s acidic juice will corrode the metal parts of your disposal. The mixture of salt and ice contains metal-eating acid, too. The coffee grounds are abrasive enough to clean the gunk off the blades and make it smell like a cup of americano, but they’ll accumulate in pipes and clog them.

The best natural cleaner for your disposal is good old baking soda. It’s mildly abrasive so it will clean the blades, but it’s a base, not an acid, and won’t damage the metal. Best of all, a box with enough baking soda big enough to clean your disposal twice costs less than a buck.