we got a new machine just before ds2 and if I wash at 30, even with a prerinse the pooey nappies come out stained. If I wash at 60 they come out clean, so have been washing at 60. We've had no issues with nappy rash.
I wash our clothes all at lower temp.
Cloth Nappy Tree gives you a free, unbiased and privacy rich place to discuss and recycle your cloth nappies. Save time, money and our planet by inspiring and helping others.