According to the IICRC S300 standard, how often should upholstery ideally be cleaned?

The recommendation for cleaning upholstery, as outlined in the IICRC S300 standard, is every 12 to 24 months. This frequency balances the need for maintenance with the understanding that upholstery will accumulate dirt, allergens, and other contaminants over time, which can impact both appearance and indoor air quality. Regular cleaning within this timeframe helps to preserve the fabric, prolong its lifespan, and maintain a healthy environment for occupants.

Choosing to clean upholstery every month, as suggested in one of the options, may be excessive for typical residential settings and could lead to fabric wear. On the opposite end, cleaning every 24 to 36 months may not adequately address the buildup of dirt and allergens, potentially leading to more significant issues over time. The 12 to 24 month interval is a practical guideline that helps ensure upholstery remains clean without risking damage from over-cleaning.