I used to be a detailer through HS & then College. I def. have issues when it comes to a clean car.
I have a water purifier @ home along with a water softner. I wash the cars twice a week & polish them every 3 months.

As far as products go the best of the shelf product is Prob NXT liquid followed by the paste. NXT gives the look of Zaino @ a much much lower cost.
ICE is ok but it's durability does suck. The think that I love about ice is you can use it on pretty much anything. It is great for detailing under the hood.

When I am really going for the showroom look I always use Wolfgang anymore. With Klasse along with s100 running a close second.

Nothing does the job better for the money than a good old PC.

These are with Klasse & S100...