At times the company I work for barely gives you time to do the job right, much less do the "wax on wax off" thing to anything!
Now the question is... what kind of wax do you use? Personally after using Zaino on my last car I'd never go back to any other kind of wax. But that stuff is kinda spendy to be using on these kinda things (unless it's your own of course).
Ah yes, Zaino - amazing - those bros. produce an amazing product. I used to use it on a sports car I had. The liquid look it produced on the black was amazing...bar none the best I used.
For the Central AC, it gets run of the mill Meguires Cleaner Wax...if it is good enough for the Jeep it's good enough for the York... (From some things I read, I think Turtle Wax would be more appropriate for a York...)