First, make some lemon paste. Then, scrub this paste all over the sippy cups. Pay particular attention to the areas that have a stinky smell. Some parents will even let the lemon paste remain in the cup overnight.To dissolve the lemon paste, rinse it with hot water.
 Fill the sink with hot water and squirt a few drops of dishwashing liquid into it. Submerge the sippy cups in the water and wash the cups thoroughly, using the brush that you prefer. Cotton swabs and pipe cleaners are perfect for the small crannies that are hard to reach with a regular brush.


However, avoid using dishwashing soap that will leave an after taste on the sippy cup; your child may refuse to use the cup if it has a bad taste.
 Place some denture cleaning tablets in a bowl or container. Full the container with water and immerse the sippy cups in the mixture. Let the cups sit in the water while the tablets fizz.You can purchase denture tablets over-the-counter at your local pharmacy.
 Boil the vinegar then put all the sippy cups into it. Soak these cups for a few minutes. Remove and let them cool on a dishtowel.


After this, you can wash them again using a dishwashing soap for a thorough cleaning.
 You can do this by putting two to three tablespoons of baking soda into each sippy cup. Fill the inside of the sippy cup with boiling or hot water. Let the baking soda stay in the cup overnight. Wash the cups with water and soap to complete the cleaning process.
Use lemon paste.
Wash your sippy cups with dish soap solution.
Try using denture cleaning tablets.
Wash the sippy cups with vinegar.
Use baking soda.
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