We've had a problem with a moldy smell in the house. For the past couple of years it has been getting stronger and stronger. I was afraid it was coming from within the walls. No way I could afford to fix that. My wife and I noticed the smell would come and go, but we couldn't figure out what was causing it. Finally she latched on to the idea that it was worst right after she did laundry. Yes! The washing machine was moldy - UGH! Well I searched the internet and came across www.smellywasher.com. The price was reasonable so I gave it a try. I was amazed with the results. per the directions, I filled the tub with really hot water and added a few tablespoons of the powder. Within minutes a bunch of mold was floating on top of the water. I cycled the washer and repeated, soaking it overnight. I'm delighted to say that my house no longer smells! I recommend this product wholeheartedly and without reservation. I have a top loader but it says it can be use on front loaders too.