Have you ever stored bacon fat in a plastic container? It's next to possible to clean the plastic when the time comes. The same thing happens when you microwave greasy leftovers in a plastic container: it becomes irreversibly marred and impossible to clean. Why?
The molecular makeup of plastic is very close to that of fat. Which makes bacon fat very difficult to clean from plastics. So, if you're storing bacon fat for future use, put it in glass instead of plastic. Glass allows for transferring the grease when it's still hot and the container will clean up in a jiffy once it's emptied.
Related: Tip: Save Your Bacon Fat
(Image: Elizabeth Passarella)