Finnair grounds Airbus A321s over concerns with water-based seat cleaning method

Passengers affected by cancellations are being offered alternative travel options. Those who missed connecting flights will be rebooked, while others can request refunds or receive accommodation as needed.

Industry sources note that most modern aircraft seats use synthetic fabrics such as polyester or nylon blends for durability and flame resistance. Seat cushions are often made from polyurethane foam, which must be treated or paired with fire-resistant materials to meet safety regulations.

Cleaning practices for aircraft interiors vary by material. For example, leather seats require specific products and techniques to preserve their condition and ensure longevity. Deep cleaning routines usually occur every 30 to 45 days, while major maintenance checks—known as C Checks—take place roughly every 18 months based on flight hours.

Since the COVID-19 pandemic, airlines have promoted enhanced cleaning protocols, though many have scaled back these measures as passenger volumes recover. Some airlines continue to maintain certain hygiene upgrades, such as hands-free door handles in lavatories, but others have reverted to pre-pandemic cleaning schedules as operational priorities shift back toward efficiency and cost management.