Precautions for Using Water Cups
Use warm water. Rinse with warm water as very hot water can cause chips or cracks to appear in glass (make sure you replace your water cup straight away if they do). Whereas the stainless steel can take hot water, no problem.
Avoid abrasive sponges. Use a water cup brush to gently scrub the inside and outside of the water cup. Avoid abrasive and steel sponges which can cause etching on the surface of the glass. Remove really tough stains with vinegar and baking soda.
Clean the straw, flip up components and gaskets. Our toddler goes to school every morning with his trusty stainless steel water cup in hand (glass is not advised for children.) Every evening we take apart the stainless steel water cup components inside the lid and thoroughly clean them with hot water and soap, as this is where bacteria and grime can hide and linger.
Store away from sunlight. Direct sunlight may cause discoloration to your glass over time or coatings used on the outside of a stainless steal water cup. Let your water cup air dry completely with the lid off, and store in a cabinet.