Question: can you use apple cider vinegar to clean retainers?
Answer: All you need is one household ingredient: vinegar. Put your retainer in a cup and fill it up with undiluted vinegar until the piece is fully submerged. Let it sit for five minutes (or 10 if it's been a while), and that's it! ... I've found that apple cider vinegar is just as effective of a solution and tastes better.