If you have pets, consider replacing the carpeting before putting your home on the market. Many people are allergic to pets and extremely sensitive to pet odors, which even a recent, thorough cleaning may not mask. And worn carpeting, even if it is clean, can detract from a home's overall appearance, giving the impression it has not been well maintained.
If you suspect your toilet is leaking, but aren’t sure where, add some food coloring to the water in the tank. If you see colored water inside the toilet bowl, suspect a defective flapper that needs to be adjusted or replaced. If it shows outside the toilet near the back, suspect a faulty tank-bowl gasket. If you see any water on the floor near the base, check for a faulty wax ring.