Expert advice from Bob Vila, the most trusted name in home improvement, home remodeling, home repair, and DIY. Tried, True, Trustworthy Home Advice

Carpets see a lot of traffic over the warmer months, so these soft surfaces need a thorough cleaning in the fall to remove dirt and odors. In the rush to finish the project before the weather gets too cold to crack open the windows for ventilation, many homeowners forget to test the cleaning solution before they get started, and end up with a discolored patch. Harsh carpet cleaners and spot removers should always be tested in an inconspicuous spot, such as in a corner or beneath a rug, to prevent any damage.

Related: How To: Get Rid of Every Carpet Stain