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First thing ...make sure you bought a black vert top. If you check your owners manual it lists Ford products. One is for vert top care. I have no idea if it actually works. Just my 2 cents.
I hope you're not taking your car throught an automatic car wash. You not should do that with a convertible. It will leak around the window seals due to the high water pressure. Hand wash it or use the manual spray off bay.
I use Blue Magic convertible top cleaner and protectant. Works fine for me.
Go with the ragg top 2 part system that can be found on autogeek. One bottle is a cleaner, the other a protectant. Will make your top look like new and keep it that way.