The plastic material will slightly discolor after repeated usage. This off-yellow color is totally normal & will have no effect on the contents.

Warm water and vinegar with erase any remaining sports drink taste as well. Second the thorough air drying mentioned above. On top of the fridge for added warmth and air circulation.

A name brand or a store brand antibacterial denture cleanser is just as effective as any reservoir makers' tablets. If really bad, those effervescent tablets may need help with a soft wire brush as mentioned above.Make a habit after each trip to clean reservoir with the tablets overnight and air dry interior completely before storing back in gear closet.A 32 to 1, water to bleach solution will suffice & is much easier & less expensive. Thoroughly rinse afterwards.