Well, you've missed the mark a little bit. You're close, you've just wandered off track a bit.
We REALLY need to set one thing straight when we are speaking of Zaino...it is NOT a wax and it is NOT a Polish. I know that I sound like a broken record, but terminology is important. When products are mis-spoken they can be misleading in their application and intention.
Zaino does not contain a drop of wax nor does it contain abrasives that are found in a polish. Zaino is a sealant. If you were to call Sal Zaino and press him for answer as far has his product "technically" being a polish, he would tell you "no". The general public is familiar with the term polish and it is something that most people can relate to and feel comfortable with and that is why it is used so loosely when referring to Zaino. Man, I hope that makes sense.
Okay, now that we've clarified that, you will not be using a polish or wax if you are going to use the Zaino system, however, you may wish to prep your car with a clay bar and polish ("polish" being used in the strictest sense of the word). The use of a clay bar is crucial to proper paint prep and should not be overlooked. So yes, please clay your car.
Wash, clay, wash, dry, polish (if you want to address any hairline scratches in the clear), wash (yes, wash it again after polishing. The reason: Zaino will not adhere to a surface that has oils on it. Many polishes on the market contain oils) dry and then begin your Zaino process.
That should keep you busy for a while. :crazy
And no, this entire process does not need to be done every 2 weeks. Wash your car as needed, and with Zaino you are able to continuously build upon it; simply keep adding as many layers as you wish within the permitted time frame (you need to allow for curing).
The use of towels is personal preference. I do not use cotton towels on my car. I prefer high quality microfiber towels over 100% cotton any day. No comparison.
Well, I hope that this has not added to your confusion, but has a shed some light on the subject. :J