I buy Hoffman batiks. Mostly because my favorite LQS carries Hoffman and another brand that I dont' like the feel of.
I wash them the same way as all other fabrics. Warm water and a little perfume free/dye free detergent.
I wash darks, lights, reds in their own load. I've never had a problem with bleeding.
The only problem fabric Ive had was a purchased hand dye. Ended up having to wash it several times to get the excess, nonbonded procion dye out of it.