I'm about to start my Pascha basket cover, but before I do , I am wondering whether I should pre wash the floss that came in the kit (DMC 347 bright coral). When I spoke to the staff at my local embroidery store, they mentioned that red is notorious for bleeding when washed, especially on white fabric. If I do need to prewash it, what tips do you suggest? (i.e. water temp, type of soap, etc).