Many people new to cloth diapering don't realize that many diaper creams available are not cloth diaper safe. Zinc oxide can cause major wicking on your diapers as well as it is nearly impossible to wash out. You also want to watch for creams that have cod oil in them. Many diaper companies will have their recommendations on what creams to use with their diapers and some may recommend not using any creams at all so always be aware of the care instructions that come with your diapers.
Here are a list of common diaper rash creams that are safe for cloth diapers:
Angel Baby Bottom
Baby Bottom Better
California Baby (I do not recommend the Calming. It made Ava scream bloody murder and we have not used it since.)
I'm a big fan of coconut oil. I use it as Ava's daily moisturizer as well as her diaper rash cream. She is a rather yummy smelling baby. Coconut oil is all natural and completely chemical free. The only time it has not worked for us is when we had a nasty yeast rash a few weeks ago and our pediatrician had to prescribe a compound cream to get rid of the rash (she got it thanks to a food allergy and having very acidic bowel movements from it - no more yogurt). If for some reason you have to use a non-cloth diaper friendly cream I recommend purchasing the flushable liners and lining your diaper with them each change. We get our liners from Amazon. They are $6.00 a pack and got the job done of protecting the diaper from the cream.