Will get back to you about the wax/polish this Friday.
I asked them before about car wash and they recommended to wash the car with water only (no soap), and use soap once in 3 times of washing. For example, if I wash the car 3 times a month, once must be washed with soap. And, if I wash the car 6 times a month, twice of them must be washed with soap, etc. So complicated just for washing a car
I have only seen one Carrera, and another boxster in my area. Boxsters can be spotted more often around Tokyo, and my area is about 4-6 hours from Tokyo (depending on traffic).