Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Can this cup be bleached without damaging? The inside of our cups are stained from tea. I remember the insert said something about bleach.
Document: Even better is the fact that the plastic cup does not impart any off taste to the tea, something I was afraid of when I first got the cups. I have also not had any problem with staining despite that fact that the cup is white. The only drawback is the fact that there is no way to close the cup entirely.
My fiance bought his first Copco (with flip top lid) at Bed Bath and Beyond, and has loved it for both hot and cold drinks. However, after a year of coffee and tea, the cup is stained and he needed a replacement. I was disappointed that the only place to purchase a fip top lid was at Bed Bath and Beyond - especially since they were sold out, but despite the lid, the cup still works great.
I bought these mugs as gifts for some friends. They are a perfect size that will allow enough coffee or tea without going overboard. They're a manageable size and I hope that they will fit easily into a car's cup holder. I made sure they were able to go into the dishwasher, and that is the main reason I purchased these!
I had a couple of these mugs for a while and loved them so ordered more - but the new ones that I ordered got MOLD on the inside about 2 months after I got them. Very disappointed because I otherwise really like these mugs, but doesn't seem like something designed to hold liquids should mold....
Therefore I give it 3 stars. Because as far as cups go-it holds a lot, it stays warm & it does not leak.I will probably wash it again and this time use a bleach and water solution and see if I can start over with just tea. *************I thought I should update this, I let it sit with lemon juice and boiling water-no improvement.
My girlfriend got me one for Christmas, and it instantly became my favorite coffee mug! I was worried the white interior would become coffee-stained, but it is remakably stain-resistant. I love the large volume, a little bigger than the average travel mug. Beverages stay hot a long time, and once you get the hang of getting the top screwed-on correctly, is completely spill resistant. As others have said in their reviews, getting the top on right is a learning process.
Great quality! I use it all the time (definitely helping me get through finals)! The only thing lacking is that I wish the lid could be sealed - I always keep a few napkins on me to stuff inside after I finish my coffee so that I can put it in my bag without worrying about coffee dripping all over my things.
Bought so my kids would have a cup to bring tea to school in that they could lose without pissing me off too much. It works well for the purpose.
I bought this product for my Grandma about 3 weeks ago for her birthday because these are her favorite style coffee mugs, and Amazon was the only place that I could find something like it. She had one that I bought her about 2+ years ago from Walgreens that held up for those 2+ years with daily use and was actually still in perfect working condition when she threw it in the trash, it was just getting dirty inside from prolonged use.
Love these cups. They look disposeable, but far from it. The lid is so easy to attach, and I don;t have to fumble around in the drawer for the typical black cup cover! Funny as it sounds, my wife said this was one of her top 3 gifts this year!
Answer: I use baking soda to get tea stains out of my cup, not sure about bleach...