This is an update to my original review in June 2010, which was very positive.This IS a nice product, producing copious suds that last, good at cleaning the vehicle.  So, nothing new there.However, I always wondered about the claims of the wash containing carnauba and polymers. Since one normally has to buff waxes off the car, just HOW did this product leave these wax type finishes on a car? Why wouldn't you have to buff this after using it?Then it occurred to me. My black car always has a good wax finish - do I NEED to be putting something from a wash in addition to that? When I wash a car, I hose it down, mix up the sudsy shampoo, wash all areas, squeegie off the water with a silicon blade and finish up by wiping up any remaining droplets/moisture with one of those damp, ChamWow type, high absorbancy felt towels. This worked fine, BUT, with the Meguiar's, I always had to follow up on the glass with an additional buffing from a bath type towel. If I didn't buff the windows, even though they had been wiped clean of droplets by the ChamWow, they would be very streaked/spotted in the direct sunlight. So, although I didn't see direct streaking of the paint, I have to assume that it had the same issue as the unbuffed windows, given I wasn't buffing the car paint itself.I actually had gone to buy a new bottle of the Meguiar's. Hadn't paid much attention to prices, in that I always want a good shampoo. But then I noticed that this product is twice the price of other name brand shampoos such as Black Magic and Rain-X. PLUS, this product calls for 1 oz per GALLON, whereas those others call for 1 oz per BUCKET. So, it's actually FOUR times the price of the others.So, came back with the Black Magic, which is just a cleaning shampoo. At 1 oz per bucket (vs. the Maquiar's 2) it foamed very well, but didn't last quite as long. But, long enough to get the job done with foamy soap. I DID notice that the windows weren't streaked and car actually DOES seem to have a better shine - but have to admit, that could be wishful thinking.So, in conclusion, think this product leaves some sort of film on the car, and not a glassy one. There are plenty of options out there at 1/4 the cost, that leave NO film.  If you are willing to pay four times the price, suspect you already keep your vehicle waxed, so the dubious benefit of this product containing waxes as protectants, is a waste of money as well as leaving a less that sparkling clean finish on the car.