My nursing bra came with this "Love Your Bra" tag which basically helps users how to take good care of their bra. ANd I understood/ remeber it this way:
1 - You should always hand wash it. Since it's padded, machine wash will worn it
2 - Wash first with clean, tap water before pouring in the detergent
3 - (Best if washed with liquid detergent) Soak the bra for 5 mins in water with proportional amount of detergent. 5 mins no more no less
4 - Scrub it with your hand with gentle amount of pressure on pressing
5 - Rinse with water and do not wring. Simply squeeze the pads with your hand
6 - Hang till dry (possible if w/ direct sunlight)
Worth all the penny you spent with the bra - will surely last like forever :D
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