How To Clean Plastic Retainers With Vinegar. Once a week, soak the retainer in warm water, white vinegar, and baking soda for 15 minutes. To use it simply mix two equal parts of water and white vinegar into a container and let your retainer soak in it for around 15 to 20 minutes.
Use gentle motions to remove debris from the inside or outside of your retainers to avoid damaging the items. In a cup, mix one part white vinegar to three parts warm water. Undiluted white vinegar is sometimes recommended.
Place your retainer into the natural cleaning solution and let it soak for 20 minutes.
The solution will be 1/2 vinegar and 1/2 water. Make sure the water isn’t too hot, though! Add equal parts white vinegar and slightly warm water (not boiling hot, as that will warp or break your retainer). Undiluted white vinegar is sometimes recommended.