Love these tumblers, they are truly the best. However I noticed if I wash them in the dishwasher, the lids can start to turn a weird yellow in an area you cant clean it. For fear of mold, i exchanged for a new one. But i advise to only wash the tumbler in the dishwasher and hand wash the lid, straw, and magnetic spout. Let air dry. Havent had an issue with my other ones since doing this
Read More