Review on Tronco 20oz Glass Tumbler with Straw, Silicone Sleeve, and Bamboo Lid - BPA Free by Christina Magnus

I bought them because, hello, bamboo and glass with silicone sleeve and straw? not love what?! but then the covers started to form. hmm, w, I used the dishwasher! How can this not be washed in the dishwasher? I've tried vinegar and bleach. Nothing gets this black shit out, and if anything it seems to be spreading MORE. the lids are officially "ready" after just a few weeks of use. The glasses themselves are still fine but now they are just regular drinking glasses which I can't use on my computer as the lids have basically made them waterproof. are now completely useless. I'll look for a replacement for the plastic cover but these glasses seriously upset me.