Cleanipedia, the cleaning advice platform owned by Unilever, has partnered with MullenLowe UK to shine a light on the stains that no one talks about.

The campaign, “Unmentionable stains”, draws attention to the guidance provided by Cleanipedia.

Retail brands Panda, Comfyballs and Pruzan are featured in three specially built out-of-home sites in London Bridge, Shoreditch and New Cross.

During the day, the OOH sites show seemingly ordinary ads for bed sheets, men’s underwear and sportswear.

But when night falls, UV lights illuminate previously unseen stains with a message from Cleanipedia offering “tips for any stain at any time” along with a QR code linking to the cleaning brand’s TikTok videos showing how to remove the respective stains.