I have purchased assorted batiks to do the Tradewinds quilt. This is my first time using batiks so I need some advice. I usually do not prewash my fabrics but I know that batiks are different. Do I wash them in hot, warm, or cold water? Do I add white vinegar or salt to set the fabric dyes? Should I use a Shout color catcher? Can I wash all the colors at the same time or do I need to do each individually or separate them into lights and darks? I have invested more money than usual in this fabric and want to do it right! Any help or suggestions will be appreciated. Thanks!