OP here - thanks, all, for the responses. Yes, the tub works, and no, it definitely doesn't leak down to the foyer when draining! If I saw that in a house I was considering buying, I would definitely ask for more than a cleaning! =) The tub is fairly clean, but only as clean as I can get it using a sponge and Q-tips in the jet openings-- I think they want a deep clean. The problem is, most of what I am finding online is hot tub maintenance and cleaning, which is considerably more expensive. I'll figure something out -- maybe I'll contact one of those companies and see if someone can do my little old tub for cheap?
One lesson I've learned: Jetted tubs are great for vacations, not so much for the home. I think I've used it a grand total of five times, and now this headache!
Anyway, thanks again!