I got to tell you, I absolutely love this top. I just took mine off this past weekend to reinstall the hard-top for the winter, and damn it disassembled so nicely. Really great quality with the rails, bars, and soft top material. I would agree the top washes very easily, however mine does leave a little shadow of where mud and dirt has been allowed to dry and cake on. It's not a big deal, but I think that's where you were going with your question.
Here's a general pic of the top. (note mine is a little lumpy as my family cage protrudes in some areas):