If you’re seeing spots and gunk starting to build up on your liner, you can try scrubbing them with a little all-purpose cleaner, but to clean the whole thing all at once you’ve got to try this easy trick. Throw it in the washing machine. Yep, it'll survive. Just give it a short wash in the gentle cycle with cold water. If you have kitchen rags or old towels, add them to keep the plastic from sticking to itself and tearing. Hang up to dry. Done!