At some point, you have to throw out the fat. You can’t use the same batch over and over forever, because the fat was cooked with foods that are capable of producing bacteria if left to sit around long enough, and it can take on the flavor of whatever you are cooking. After the fat has been rendered, we recommend using it only once, and then discarding the used portion. So what is the proper way to toss it?
Bacon grease hardens when it cools. The easiest cleanup is to allow the fat to harden and then use a paper towel or rubber spatula to knock it into the trash.
Important: Never pour hot bacon fat down the drain, even if you have a garbage disposal! As it cools, it will harden and clog the pipes. Running water isn’t enough to dislodge this grease. Bacon fat, like the fat of other animals, can turn rancid, and it is not a smell you want emanating from your kitchen sink. You also shouldn’t use any type of meat or meat product in compost because the meat could contain pathogens that the compost may not be hot enough to kill. This can attract predatory animals, which can pose a danger to small children and house pets.