I had some purple blue dye transfer onto my nice white guest bath towels, ruining them completely. I had spent a lot of money on these towels and only had one guest use them so far so I was upset and trying to find a way to save them. I have tried every other method to turn them white again and nothing else has worked until now! Two packets in the top loader, soaked for 20min with very hot water, then rinsed and ran a quick load to wash everything out and my towels are good as new. I can’t believe it! This is an amazing product. I wish I had taken a before and after photo to show the difference, but I honestly didn’t think it was going to work so I didn’t bother. As others have stated, it does have a strong chemical smell and should be used with care in a well ventilated area. If you have a garment with dye transfer you want to turn back white, this product works to lift and remove the stain completely.