FFP2 masks cannot be washed.
FFP2 masks are similar to N95 and kn95 masks and cannot be cleaned. Because wet will cause the mask electrostatic discharge, unable to absorb dust with diameter less than 5um.
High temperature steam disinfection is similar to cleaning, water vapor can also cause electrostatic discharge, leading to mask failure.
If you have UV lamp at home, you can consider using UV lamp to sterilize the mask surface, so as to prevent accidental contact with the mask surface and pollution. High temperature can also kill bacteria, but masks are usually made of inflammable materials. High temperature may also cause masks to burn, causing potential safety hazards. It is not recommended to use facilities such as oven for high-temperature disinfection.