What Not To Flush  - Cotton swabs (Q-Tips®).  - Dental floss.  - Fats, oils, grease - Waste or unwanted cooking oil.  - Ground food from a garbage disposer  - Hair.  - Laundry detergent - Avoid using more than the necessary amount of powdered detergent.  - Tampons.  - Unwanted cooking oil, cleaners, and the like.  - Washing machine lint.  - Chemicals - Photo chemicals, paints, thinners, oils, varnishes, pesticides, used motor oil, unwanted cooking oil.  - Cigarette butts.  - Coffee grounds.  - Dirt, such as from people who clean their flower pots in the bath tub.  - Drugs, prescription or non-prescription medicines.  - Condoms.