I've heard that the sense of smell is the one that can invoke the most memories.
I was reminded of this at my cater-waiter job, when I caught a whiff of Palmolive dish soap and immediately thought of my grandmother. It was such a strong memory, that I had to stop at the 24-hour Wal-Mart and pick up a bottle on my way home.
I cleaned the house with it and it smelled great. I did learn, however, that while Palmolive may be tough on grease and gentle on your hands, it sucks as a floorcleaner.
At least my house smelled good.