Claim your FREE Fresh Knight Ultrasonic Retainer Cleaner. Great for at-home or travel use, the Sonic Fresh Ultrasonic UV Clean is an all-in-one cleaner for jewelry, retainers, aligners, and nightguards. Experience cleanliness at your fingertips. A powerful ultrasonic cleaner machine and a run time of just 5 minutes, this device makes a great retainer cleaner, eradicating debris in no time. If you want to get this freebie, click on the “Get FREE” button and fill out the form. The number of samples is limited, so don’t miss out on this opportunity.