While garbage disposals can handle many food scraps, there are items that should not be put in the disposal, such as: Grease, fats, and oils: These substances can solidify and clog the disposal and pipes. Stringy or fibrous foods: Examples include celery, corn husks, and onion skins, which can tangle the blades. Hard items: Bones, fruit pits, and non-food items can damage the disposal. Starchy foods: Pasta, rice, and potato peels can expand and cause clogs. Coffee grounds: These can accumulate and cause blockages. Educating homeowners about proper garbage disposal usage can help prevent common issues and prolong the lifespan of the unit. When it comes to garbage disposal repair and installation, it is advisable to consult a Sims & Sons professional to ensure safe and effective solutions.