This Review Title is Best solution has been to presoak collar and the content is: Unfortunately not a silver bullet for preventing the collar ring. Found that to fully prevent a brown ring, I'd have to cover enough of the collar to clearly show the tape. I stopped using it after a week.<br /><br />Best solution has been to presoak collar, scrub with a brush, soak in Oxiclean White Revive. Takes all the brown out..There are other information for this review, one is This reviewer did purchase it and the other is 0 people think this review is helpful.