As I recall, our 96 was finished with Epifanes Rubbed Effect Varnish, very high quality and easy to use. If you are just applying one or two maintenance coats, the Rubbed Effect is great by itself. If you are starting from bare wood, apply several build up coats of Epifanes Woodfinish Gloss, which does not require sanding between coats, then finish with two or three coats of Rubbed Effect varnish. Follow the instructions closely.
Of coarse, there are other varnishes, but I am pretty sure that's what PSC used on ours.
As to cleaning up stains, there are many points of view. My view is, start gently with a damp cloth. If that doesn't work, I try Method wood finish cleaner. If still no go, try a little paint thinner. Usually one of these does the trick. If the wood is in bad enough shape to require refinishing, be sure to remove any stains that are oil based from the wood with paint thinner before you start sanding, or you will just drive the oil further into the wood with the sandpaper
PSC34 #305 Swan