I had a problem with my kitchen drain. I always dumped grease down it and it caused some major plumbing problems. I called a plumber to come fix it for me and they told me never to put grease down my drain. I never knew this before and that's why I did it. The work I had to have done ended up costing me lots of money, just because of some grease. At least now I know that you shouldn't put grease down your drains and it's something I won't do ever again.