Super excited about this product. I just got it yesterday and it's already changed my game! I've been wearing a retainer (post-braces) for 20 years. This is going to sound gross, but it's the same retainer I got from my orthodontist when I got my braces removed. I've used denture cleaner every single night for those 20 years, and taken it to the dentist with me two times per year when I go in for a cleaning and they professionally clean it (if you didn't know you can do that, you can and it's free!).
I did have to run the 5-minute cycle about three times, but then it just got super clean, took away a couple of light stains that have been there for AGES, and yes their minty cleaning tablets are worth it!