My Guard Wash. The Ultimate Mouth Guard Container for Mouth Guards, Night Guards and Dental Appliances. Directions: 1. Pour in desired mouthwash/oral solution to fill line on device (mouthwash/oral solution sold separately) 2. Place mouth guard/night guard/dental appliance upside down (as to allow for proper drainage) on the lid assembly 3. Close lid tightly to prevent leakage 4. Lightly swirl My Guard Wash, allowing the liquid to fully cleanse the mouth guard/night guard/dental appliance 5. Unscrew lid and remove mouth guard/night guard/dental appliance 6. Proceed to play!