Hi ALAN81,
Usually what I do is to evaluate the situation. I would ask my family member or friend some of the following questions to get a better idea of their car maintenance habits when it comes down to detailing his/her car.
1. How often does he/she wash the car now?
2. How often does he/she wax or polish the car now?
3. What type of products have they been using?
etc...
Based on these questions and others I ask, I pretty much know what products to use. I would use the same products on their cars that I use on my car. If they don't mine the additional maintenance then I would go with a wax. However, if their always on the go and don't plan to wax the car every 6-8 weeks then I would suggest a polymer for durability and lower maintenance requirements. So it really all depends on the feedback I get from the person that determines what I will use on his/her car. But which ever direction we go, only quality products will be used. Such as Zaino, Klasse, P21S, Pinnacle Paste Glaz or Souveran (depends on color of car), One Grand Blitz Wax. If they do want something cheaper but is still good and that they can get locally, I would recommend the Meguiars Professional Line (beige bottles).
Aloha,
~Ranney