We are using hydrozole at the moment too. We're using microfleece liners, but it doesn't seem to be staining them. I still use them just to be safe though! We are using Canesten rinse in every wash. Also we are trying to use non-PUL nappies where possible, so fitteds without covers or nappies that use fleece as their waterproof layer for improved breathability.

Good luck, I hope it clears up for you!