It looks like you're well on your way towards dealing with the leak. Sorry that I can't help with the removal of the weatherstrip part but perhaps you could identify it in the parts catalog and give Service Administration a call. They have a reputation of being quite helpful to owners. They can be reached at
How do I contact Winnebago Industries?
Mail: Winnebago Industries, Inc.
605 W. Crystal Lake Rd
P.O. Box 152
Forest City, IA 50436-0152
Corporate Switchboard: (641) 585-3535
Service Administration: (800) 537-1885
Fax: (641) 585-6966
E-mail: or@winnebagoind.com
and the page in the parts catalog that shows most of the relevant windshield parts is on the next to last page, 218 I think.
Windshield parts detailsAl
