A friend of mine had her grown daughter staying with her for a while. The daughter had two cats and my friend was particularly allergic to the one cat. The daughter tried the cat wipes that are for people allergies and my friend couldn't believe it! She had no allergic problems at all. That might be the simplest thing to start with.
If you do start getting them used to bathing while young, I have heard that Dawn dish detergent matches the pH of their skin. There are also shampoos at pet stores - including a dry one that you just brush out.
Hope all goes well and we at PT really like pictures...hint, hint...
"Common sense and a sense of humor are the same thing, moving at different speeds. A sense of humor is just common sense, dancing." -- William James