Daverat's Wife Speaking: We began using this when our house was sold and we moved into a Condo, having to share a laundry room with people who toss smelly workout clothes into the washers without a thought for the people who use the washer next. We'd put our clothes in dirty but not bad-smelling and they'd come out dirtier and smelly! I tried using washing machine cleaners before doing my laundry, but nothing worked. A nurse friend recommended this brand, and I will never go back to Tide! It does the job! No more stinky clothes from other people's armpits or ball sweat! The clothes come out CLEAN and with NO ODOR.I use the liquid, which is very concentrated. I do have sensitive skin and Defunkify has never irritated my skin in any way. I used to add scent beads to try and cover up the odors of biological deposits left on my clothes from using a communal washing machine but now, it is no longer necessary. I do still pay to run a load with a washing machine cleaner a couple times a month because we have people that use far too much detergent, scent beads and other crap and it builds up, but in general, if it is a single home washer, Defunkify is all you will ever need. I have washed my own workout clothing or very sweaty clothing and this stuff really is good at breaking down what is called Biofilm, the dead skin, and body secretions that are particularly stinky. Also, being a married couple, this is very good for bedding, if you catch my meaning.I would suggest that if you NEED a scent on your clothing, use a scented dryer sheet instead of s scented laundry detergent and use Defunkify on all your loads. Some of my neighbors who frequently wash their clothes right after I do, have told me that even THEIR clothes smell better now, so Defunkify is doing exactly what it claims to do: get rid of Biofilms and dirt that would normally redeposit on your laundry AND preventing the buildup of Biofilm in the machine itself. The clothes have NO smell at all and stay fresh for months in my closet if stored properly next to other clean clothing. If you stick some musty item next to your clen clothes, those clothes will smell musty too. Therefore, you may want to do what I did, and slowly cycle all your clothing thru a wash with Defunkify!I cannot recommend this more highly! Defunkify has also turned out to be a great value for the price. It is easy to measure and load for load, far cheaper than Tide Pods or other detergent Pods. I do use dryer sheets of a different brand with no scent for softening and static control. Defunkify replaces detergent Pod, scent beads, liquid fabric softener and Lysol Laundry Sanitizer, all expensive products. You need to factor that into the value of this excellent detergent!