Yes, you can use regular car soap on the top, just be sure to rinse well. You will know when to retreat when water no longer beads. I usually retreat annually in the spring before the first drive after winter. Car washes are definitely a NO, too much water pressure and I don't want anything to damage paint or top. No wax on the top just 303. Just hand wash, I use Griots garage car soap. You can find at Advance Auto and other online stores.