I never did the front window, but it is flat and should be easier. Is it double pane. Generally the windows are time intensive and the gaskets are hard if not impossible to find. There are a couple of threads on the subject of cleaning out smaller double pane windows if you do a search
VISTA VIEW WINDOW
The inner pane on yours may be recmovable without taking out the window. Look carefully at the inside. If not you can 1. carefully break out the inner pane or 2. drill out all the rivets, remove the vulkem, take out the window assembly, take the window frame apart, clean, put in a new butyl spacer gasket and reassemble. You may or may not be able to reusue the old gasket.
Consider replacing with good used windows. It's a lot quicker and easier.
There should be several low point drain valves one in the line coming out of the fresh water tank. You shouldn't have to add antifreeze to the tank. But if you want dump in a bottle of vodka after it's drained.
1. Keep your eye on ebay 2. Post in the Forum Classifieds
Sail on silver girl. Sail on by. Your time has come to shine.