You suggested putting lemons and ice cubes in a garbage disposal help to keep the blades 'sharp'? That's just more 'cutting' that dulls the blades.
Eric Stromer does NOT know everything ! You are correct Beauxx -that certainly does nothing to sharpen blades.
Other people asked questions on similar topics, check out the answers they received:
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them