a nice standard wipe for just about anything you will put in your mouth [SEP] i do not have a retainer but i do have a nightguard and i figured that since it is made out of the same stuff you would see for some of the mouthguards and the like out there why not give it a try i am always a little leery of brushing since i do not want to ruin my brushes or potentially harm my nightguard soaking it in some mouthwash is helpful but then that is not the same as a thorough cleanthe taste of this is fairly nice i like that it is not extremely overwhelming you can wipe your guard down and it will not be insanely strong there will be a hint of flavor but overall it is not going to be anything that will knock your socks off this might be disappointing for some but it is still a better thing to taste than the alternative if you have a guard of any type you know what i am talking aboutthis will get into most of the crevices and areas of the average guard you will have to cram it into the more small areas but it will fit everywhere it seems to do a fairly good job of cleaning as well i would read that it could help get rid of stains and other discolorations which is the biggest thing that appealed to me so far i have done a few cloths and it seems to be helping a little it is not a miracle worker but then i was not expecting it to be and to be honest i would be more than a little leery of something that would remove all the yellowing immediately after all what would it do to your mouth afterwardsthis is a pretty good option and i am curious to try the soaks to see what they would do as well