Over time your drains will most likely become clogged. Hair, grease and other debris will accumulate in the drain, gradually stopping the water from flowing. Here's a way you can unclog the drain yourself without resorting to chemicals or an expensive local contractor.
Step 1 – Put 3/4 of a cup of dry baking soda down the drain.
Step 2 – Pour 1/2 cup of vinegar down the drain after the baking soda. The mixture will
immediately start to fizz. Be sure to cover the drain with a plug, filling the hole
completely so that nothing can escape.
Step 3 – Leave this concoction in the drain for about 30 minutes. While you are waiting, boil a kettle full of water.
Step 4 – After 30 minutes remove the plug and slowly pour the hot water down the drain.