Carpet Cleaning Myth: New Carpet Doesn’t Need Cleaning. Oftentimes when people refer to their carpet as “new", it’s already a few years old. Since carpet is designed to hide soils effectively, it’s important to keep up with a regular carpet cleaning schedule (typically between 6-12 months but definitely before the 18 month mark), rather than waiting for it to “look dirty.” By the time a carpet “looks dirty,” damage to the carpet fiber has already occurred. Also, most carpet manufacturers require professional carpet cleanings to maintain the warranty on the carpet so it’s a good idea to read the fine print to ensure compliance.