I have a 2005 Buick Lesabre with a soft top. I don’t know why it has a soft top, I can’t find any other models that have soft tops. The soft top does have a Buick logo on it so it’s hard to determine whether it is after market or came from Buick with a soft top. I kind of liked it at first, however I tried to wash it and there is some kind of stain that is not coming out. I think I would like to remove the soft top, and just have a white top. How difficult will this be?