I stumbled upon this product while wallering the internet trying to figure out how to get rid of stubborn embedded fabric softener stank in a sweatshirt I had been gifted-with about a week to go before a brutal cold spell. I was particularly interested in the shirt because it was 100% cotton and I have problems with synthetics. After weeks of vinegar and soda launderings, and airings outside in the sunshine, the odor retreated to the huge painted logo on the shirt. And would not budge. It was then that I discovered microencapsulation technology!