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Big clean-up at Saint-Eustache, or just big nonsense?

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1. AI-generated poster calling for a “big clean-up” of the church of Saint-Eustache.
Photo: Didier Rykner

Being treated by a priest, in his own church, as a “fouille-merde” (sic) [1] because one explains to him that what he is doing is contrary to the law and dangerous for works of art, is an unprecedented experience, which the author of these lines experienced last Saturday. The parish priest, Pierre Vivarès, had in fact called on Instagram (and through a poster placed on a noticeboard in the ambulatory - ill. 1) for a “big clean-up of the church!”. The visual, clearly, was generated using artificial intelligence, and it showed five people in work overalls, two of whom were cleaning works with a feather duster.


2. O’Cedar multi-surface dusting spray used for cleaning in the church of Saint-Eustache in Paris on 20 June 2026.
Photo: Didier Rykner
3. The pulpit of Saint-Eustache, carved by Victor Pyanet after a design by Victor Baltard, cleaned with O’Cedar by two volunteers.
Photo: Didier Rykner

If it had only been a feather duster, it would not have been too serious. But this went far beyond a feather duster. We were able to observe that most of the volunteers were using a spray product, Ocedar multi-surface dusting spray (ill. 2), which they applied with a cloth to a considerable number of works and decorative elements.


4. A volunteer applying O’Cedar to the 1720 churchwardens’ bench, by Pierre Lepautre after drawings by Jean-Sylvain Cartault.
Photo: Didier Rykner
5. 18th- or 19th-century lectern recently restored and treated with O’Cedar.
Photo: Didier Rykner

Everything was affected: the choir and apse rooms, the confessionals, the pulpit designed by Victor Baltard (ill. 3), the…

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