I use the car soap made or recommended by the sealant I have on. When I had Zaino z2, I used their Z7 wash.
I currently have Cquartz UK and getting their Reset car shampoo.
BTW, Cquartz is amazing. Very slick but no oily feeling. Water beads into little globes. My cheap electric lawn blower can blow the water off.
I've used Zaino, Klass, Menzerna, Blackfire, Nitro 3D and Cquartz beats them all.
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