I am wondering about this product. Do you have to use it just once when you first wash your fabric or do you use it several times? Can it also be used on fabric that has already been stained by running Color? Thanks

You use the Dr. Beckman's Colour and Dirt Collector the first time you wash your handwoven article. If - for instance - I'm weaving tea towels, I throw a Dr. Beckman's sheet in the washing machine and wash/dry the tea towel in the way I will in the future. One of the colours that loves to run is red - and if I have a lot of red in my cloth - I may even throw more than one colour remover sheet into the washer. Once the cloth has been through the dryer - it's set :-( If the item you are concerned about, hasn't b been through the dryer - it might be worth trying......