May I bring to your attention the following "wonder-wash/wax".
I came upon the following thro" a friend, & was wary until I tried it.
The wash/wax is called : WILLIAMS WATERLESS WASH & WAX, & can be purchased over the internet.
I have no idea how this works, but work it does!. I even tried it on an inconspicuous area, & what a difference it makes. Pse try it!!. ps I don't work for Williams, the F1 team!!.