I've always heard that pouring grease down the drain is a bad idea..unless you run hot water down the drain afterwards. That was bad advice, according to Angie's List.com. NEVER pour grease down the drain because when the the water cools the grease will pool and clog the drain. If you still do it anyway, experts say you should try to pour bleach down the sink once a week. Take a look at what else might help and how much it could cost to fix the clog...