Actually, I used a can of compressed air to clean the dust anddirt out of the inner workings, then windex and a paper towel to clean the yuck off of her outer self, then a soft cloth and some of my sewing machine oil to wipe down the whole thing. Was fairly easy.
As for price, I got this one for $50, but I saw another one in a lot better shape, a treadle in it's original cabinet for $150. If it hadn't been between paydays I think I might have gone with that one, but Miss Tilly just looked so forlorn sitting there all dusty and drab.