I am blown away by the Cleanadent Liquid Crystals. I have been soaking my maxillary Essex clear ortho retainer in Efferent tablets off and on for years, but there was always a white film buildup in the rugae on the tissue surface that would not diminish. One week with the cleanser and the film is completely gone! As a bonus, there must have been an imperceptible film on the smooth palatal surface, because it has returned from a textured surface to my tongue to a slick smooth surface. It feels like a brand new appliance! This product is amazing. I didn’t even need the sonic cleaner to accomplish this. (I gave that to a denture patient). Great products!