?Use Glasslock's Dirt-Bye Cleaning Utensil to clean all the grooves and hard to reach places. Dirt Bye is an innovative cleaning tool for lids, grooves and threads commonly found on baby products, airtight containers, water bottles and other daily supplies. Dirt Bye can clean difficult to reach places and cannot be cleaned with a general dish sponge. Perfect for cleaning baby bottles, trays, spoons, airtight containers, thermos, belnders, coffee machines and more. Made from environmentally friendly materials Includes instructions on how to clean Can clean difficult to reach places and cannot be cleaned with a general dish sponge