If you see resedue on the liner anywhere wipe with a little mild dish soap and water.
For a more thourough cleaning, submerge in diluted dish soap and water for 15 minuites to allow the soap to penetrate the seams. Allow 24 hrs to dry sufficiently.
Or, use an enzyme cleaner and follow the instructions on the bottle.
* Do NOT put the liner in dishwasher, dryer or washing machine.