How is it water will produce a stain of itself on your seats? I cleaned my driver's side seat cushion with a clean wet sponge using cold water, and after the cushion had dried, where I had wiped a water mark was left. Seems that when water dries it wouldn't leave a mark, but this isn't the case. Has anyone else had this problem? And would you please recommend a seat cleaner, which is reliable and has been known to work very well. Thanks, Adam.