Unless the amount that has oozed out is excessive, I suggest just leave it alone. If it is excessive, I would do like BFlinn suggested if I did anything. Cleaning the butyl tape with acetone or the like could very well cause problems. With your coach being a 96 model it may very well need to have all windows resealed. I have owned a coach of similar vintage and never had a problem.
John- 2011 Fleetwood Southwind 32V