The wet test is all fine if you're just trying to determine whether or not the fabric is wet cleanable, or if the dyes are stable but on the fabric in the first clip I would be far more worried about cleanabiility, especially on the lighter versions of that same fabric, because when dirty can be a real challenge to get clean and then there is the lengthy drying time to worry about. So I tend to see these problem fabrics from a different perspective which is more about what the client gains from the finished product, which is sometimes open to question because of the nature of the fabric.
Simon