How to Clean a Reusable Water Bottle — Toronto Home Guide

Reusable water bottles develop a slimy biofilm coating from mouth contact and sitting water if not cleaned daily. Stainless steel bottles can also develop odours from coffee or other drinks. A proper daily clean and weekly deep clean keeps them hygienic.

Daily Clean

1. Disassemble all parts — lid, straw, gasket rings, and any other removable components
2. Wash each part with hot water and dish soap, using a bottle brush to reach the inside of the bottle
3. Pay particular attention to the lid threads, gasket grooves, and straw — these are where biofilm accumulates
4. Rinse thoroughly
5. Allow all parts to air dry completely before reassembling — drying fully prevents mould growth

Weekly Deep Clean

1. Add 2 tablespoons of baking soda to the bottle
2. Fill halfway with warm water, cap, and shake vigorously
3. Let sit for 15–30 minutes
4. Scrub with a bottle brush and rinse thoroughly

Alternatively, fill with equal parts white vinegar and water, let sit for 30 minutes, rinse well.

Removing Mould

If you notice black or green mould spots (usually inside the lid or gasket):

1. Disassemble completely
2. Soak gaskets and lid parts in a diluted bleach solution (1 teaspoon bleach per cup of water) for 10 minutes
3. Scrub with a small brush and rinse extremely thoroughly — residual bleach affects taste
4. Allow to dry completely

Tips

• Check if your bottle is dishwasher safe — many stainless steel bottles are, but the lid and gaskets often need hand washing
• Don't leave water sitting in a closed bottle overnight — empty and leave open to dry between uses
• Replace rubber gaskets every 6–12 months — they degrade and harbour bacteria even with regular cleaning
• If a stainless bottle permanently smells of coffee or other drinks despite cleaning, fill with hot water and two denture-cleaning tablets overnight — rinse thoroughly