If anyone has a pop-top which needs cleaning and restoring, I recommend 3M
Marine One-Step Cleaner and Wax for the job. It did a great job of removing
the white chalking appearance on the roof of my pop-top and bringing back
the original colour with a protective shine. Oh, oh, I sound like a bloody
commercial!  Whatever...it works wonders.

Roy O.
'87 Westfalia
(till death us do part)