lol that’s the worst

I hope your immune system got stronger from the workout (and that you didn’t get sick)

If you have any sugar in your drink (including: milk, fruit tea) you need to rinse it out daily or you will get a rotten stank/flavor that doesn’t seem to wash out.

To get rid of it, you just need to remove any seals and soak everything in warm water with a little denture cleaner or oxi-clean. I usually just put the gaskets inside the cup with a little cleaner, set the lid on, and fill it until it just starts to overflow. This will also remove any tea/coffee stains and you can use those to gauge whether it has soaked long enough.

Don't wash the knockoffs in a dishwasher, the cheaper seals can't handle the expansion and contraction. If you're not willing to hand wash you need to buy quality which isn't necessarily Yeti but you'll need to do research.