@kaia Just wanting to make sure we're not talking past each other here: FFP2-NR are the disposable ones you buy in a pack and use once each. FFP2-R are sold as single items and can be washed in the sink/disinfected with alcohol around 50 times and reused. The "filtered" ones are a vanity-mask with disposable FFP2-NR inserts that give it the protective factor. Are you talking about disinfecting the vanity-mask?