The MugBug had some original wiper arms and seals on the wiper pivots. Those arms have springs that sometimes manage to get rusty - Make sure they operate like springs and aren't rusted shut. A little lube sprayed in makes it all good. Check those body seals under the arm nuts, They get hard and crusty like somebody who hasn't had their nap. Replace them, and spray some lube all over...
Take a peek on the gift table at the Christmas party and you may just see a set of seals and wiper cones for a Bus.. :)
Thanks Rich! good ideas! and good humor thumpup)-