How To Clean My Plastic Retainer. Likewise, using bleach to clean a retainer is not advisable, because it can degrade the plastic base and also give the retainer a strong, unpleasant odor. Never brush your retainer with toothpaste—it can make it dull and scratch away the shine
To clean your retainer case: If you’re noticing white deposits from calcium buildup, try soaking your retainer in a mixture of 1 part white vinegar to 3 parts water for 15 minutes. If you do brush your retainer, use a very soft toothbrush so you don’t scratch the clear plastic;
Pour vinegar into the water to make a 50/50 solution.
Likewise, using bleach to clean a retainer is not advisable, because it can degrade the plastic base and also give the retainer a strong, unpleasant odor. This is another natural ingredient you can use to clean a retainer without fear of damaging it. How to clean your retainer with baking soda Make sure the cup is such that the retainer submerges in the mixture.