OK I broke down and rented a Rug Doctor. My carpet is a little under two years old and not in bad shape except I have a pellet stove and no matter what you do, it puts out a fine gray ash that dulls everything. So far, the results seem good, it will never look like new again, but looks a whole lot better than before. Problem being is that it uses a TON of water and I can hardly get by doing 75 sq ft or so without refill. Opinions? Hints? Anybody know the great Rug Doctor secrets held...