After using hair conditioner through the wet hair is the best time to comb your wig. Just waiting for it dry, you can brush your kinky hair very easily. Also, bush as same as your real hair when you working out a kinky wig tangle. You need to start at the top and go down otherwise the tangle will bunch up more.
As for extension hair, it seems more complicated since they are attached in your head. It is very easily to mess up your extension hair and your real hair if you are not very careful. Thus, proper shampoo and conditioner should be choose especially hair care products for gentle detangle extensions.