This is a test of commonsense. Complete the next sentence:

How to clean your retainer
Rinse off the retainer with warm or cold (not hot) water.
Place the retainer in a shallow cup, big enough to fully hold it.
Pour vinegar into the cup until the retainer is fully submerged.
Let it sit for 2 to 5 minutes. Longer is not necessary, as the vinegar could begin to degrade the plastic.