Brighten Your Piano's Tune
Like a house or a car, pianos are an investment. They should be handled with care and maintained as you would a car, since they can cost about the same amount of money. When it's out of tune, tune it. When it looks grimy, clean it!
Is your old piano known for not only bright melodies but also for dingy keys? Squeeze a little toothpaste on a soft toothbrush, scrub the keys gently, and then wipe clean with a damp cloth. Try to keep the toothpaste from getting in between the keys. If that happens, scrape off the paste with a piece of paper lodged between the keys.