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