A high-tech cleanroom that must be completely dust-free, immense sewage pipes being unclogged, a Renaissance painting being cleaned with a cotton swab and angelic patience, a surgeon's hands that must not only be clean but also sterile, the purifying incense in a Catholic church... With remarkably ‘clean’ editing and great sound design that perfectly complements the images, this mosaic documentary immerses you in cleaning practices in a hugely varied range of working, institutional and social environments.