Kitchen sink clogs can often be avoided by properly disposing of food scraps.In rental properties they ussually install less then the best because they know that tenant's ussually are very hard on them. By taking steps every day to make sure they are clean and running right can save time and money later. The top eight foods that will back up your drain are: 1. Egg shells 2. Rice 3. Pasta 4. Grease 5. Potato peels 6. Banana skins 7. Celery 8. Coffee grounds If you garbage disposal blad.