Just hoping someone has an idea on how to get mould out of bamboo fabric.

I've got some cloth breast pads (only in the past 3-5 months - only been milked the past 7.5 weeks) and I seem to have mould in 4 out of the 14 that I've got - started in the past week. None match up into pairs. I change them (individually) as soon as I notice that they're wet though - not necessarily soaked. Have tried a hot wash and fabric colour safe bleach as well as normal detergent washes. Usually I chuck them in a bra bag with my bra while washing DS's nappies (less than normal amount of detergent) every other day at the least (they get washed a bit more often than our clothes at the moment) or if I need to wash my & DH's clothes they'll go in there with normal amount of detergent. They get dried on the line outside or on the clothes rack inside (been a bit wet & cold here to dry quick enough and I don't have a dryer at home).