I've always just thrown my fabric in with a load of wash, if it doesn't make up a full load, in like colors. I always wash in cold water, but don't add fabric softener. You can use Orvus instead of detergent, which is what most LQSs recommend for laundering your quilts. Then I just toss in the dryer, and if I can catch it in time, take the fabric out while still damp and it will be easier to iron. Also, cut the corner off each piece of fabric - it cuts down on the fraying.