Originally Posted by Prism99
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Orvus is a soap specifically made for washing quilts, but I don't think most quilters use it also to prewash fabrics.
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Sorry, but this struck me as funny. Marketing is everything. Actually Orvus was made for washing horses and cows, and is now also sold for quilts. You can pay about $8 for 8 oz marked for quilts, or about $18 for 7.5 pounds at a farm and ranch store.