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Regarding the other 2 Meguiars Shampoo's, i haven't tried them, nor really heard of them.
YoSteve said:
When did we come to the conclusion that this stuff is harsh. I'm confused. :nixweiss
Brad B. said:Pinnacle is pretty strong stuff. I would dilute if FOR SURE. To cite an example, I stripped two coats of Pinnacle Paste Glaz completely off my Porsche with one wash of Pinnacle shampoo. Now, granted, it's apples and oranges (Glaza carnuba and Klasse is a polymer) but P21S or Gold Class will not strip the Paste Glaz off. So it puts it in perspective. Pinnacle shampoo is a great cleaner but it is strong so use it carefully and only when warranted. That's all. The same is true with any shampoo, really. They eat at the surface, it's what they do, so use them carefully and as needed. I only use a shampoo every few washes at most.