Easy to Use: Effectively wash away the tough stains and odors in your stainless steel, glass, or plastic bottles and tumblers. Fill your drinkware with warm water & tablet, then let it soak for 15-30 minutes. For tougher stains, let it soak overnight. Safety: Fragrance and chlorine free, the cleaning tablets are safe to use on your everyday drinkware. EPA Safer Choice Certified Product, Made in the USA. Click here to see the Safer Choice Disclaimer. Instructions on how-to use the Simple Modern Cleaning Tablets can be found here.