In-Sink-Erator®, the manufacturer of the garbage disposals Lancia uses, advises you use cold water when grinding food waste. To freshen your disposal drain, grind citrus peels or run eggshells through. Run the disposal after draining a sink-full of water. Avoid grinding fibrous materials like corn husks because they can cause drain blockages. Never place your hand in the disposal. If you have to retrieve something from the drain, use a pair of metal tongs.