I'm not sure what liners are in those ones, I used Baby behinds PUL covers with bamboo foldups (some bamboo fleece and others bamboo terry) then I got microfleece from an online store and cut it down into liners. I have heard that some babies can be irritated by the fleece though so maybe that is the problem if it's the fabric against the bottom? The caster oil is soothing an the zinc is healing. Most supermarkets and pharmacies sell it in the baby isle. It's also what the pead recommended as the best thing for nappy rash. The caster oil makes the zinc spread much easier too, it's much nicer that the sudeo (sp?) cream IMO. I'm not too sure about tea tree and eucalyptus though? They are both really harsh and drying on the skin. tea tree is great for fungal things but if you are already using a fungal cream and it didn't clear up the rash than it must not be a fungal problem so why risk drying out the skin even more with tea tree or eucalyptus? I wash all the cloth nappies with teatree and water in the rinse cycle but would never put it on ds's skin. That's just me though. something soothing like lavender and a bit of oil in the bath water would be better. good luck with it.