Hey spicey. I haven't had that issue, it could be related or could be coincidence. To treat the wipes, hot water, Canesten anti-fungal rinse and sunshine. You won't be able to shift the black spots, but you can kill the mould.

For her bottom, first try a barrier cream to see if that helps (use a heavy duty liner if you use MCNs) And if it's not that, then use an anti-fungal cream, maybe like Hydrozole, and I always use it with cornflour as well, just to keep it nice and dry.

I never keep more than 3 or 4 wet at a time, too risky! Our bibs and face washers grow mould if we leave them more than 2 days without washing. I've lost so much stuff, so I'm super careful now!