I know I'm probably gonna catch some flack for this, but the best car wash solution I've used to date is Turtle Wax Zip Wax. I've used many of the others, but none of them seem to suds like the Zip Wax, and none seem to leave the high level of shine the Zip Wax leaves. It almost seems like the Zip Wax adds to the current layer protectant that's already on the paint rather than working to remove it. I put a good coat of Zaino on my car about a month ago, and washing with the ZW keeps that high gloss shine. Just for the record, I typically don't like Turtle Wax products.