Zaino hands down.

 

It creates a film on the inside windows that is very difficult to remove. I have found that when the car is closed up in the hot sun, the Stoners magnifies the film build up and it is very har d to get off. There is actually a warning on their label that says not intended for interior glass ( of course I saw that small print much later ). Thankfully I have not used it on the inside of my Stang windows.

 

Blackfire Wet Diamond for last step product.

If you want the better "over the counter" stuff that's available everywhere stick with Megs

 

I to like mothers products. Not just for the shine, but on my new england daily drivers, the water still beads even after a year. I am a big fan of the Mr. Clean system. The **** thing REALLY worked. I stocked as much product from them as I could. However, the ebay prices now make it not worth getting. These sleezes are not just doubling their profits but quadrupleing them and more. So I'll forgo the product and go back to good old fashioned elbow grease.