Common causes of drain problems vary, depending on the type of drain. Kitchen sinks can be clogged with grease, oil, food particles and overloaded garbage disposals. Bathroom sinks are prone to hair, soap, cosmetics and residue from beauty products. Tub and shower drains can be clogged with hair and soap scum as well as bathing products. Toilets may become blocked due to excessive use of toilet paper or flushing non-flushable items such as feminine products.