Lily pollen stains are notoriously tough to remove from any surface, especially carpet.
The key is to remove the pollen before it is pushed further into the fabric of the carpet.
A sticky substance such as sellotape can be used to lift the excess pollen from the surface before it’s trodden or rubbed into the carpet.
Alternatively, use a vacuum cleaner to suck the pollen up but be careful to be gentle when doing so.
After you have got the worst up, we’d recommend a combination of water and baking soda to suck up the remaining pollen. Alternatively, stain remover or cleaning products that contain enzymes are also actively effective against lily pollen when applied with a clean rag. Use a biological washing powder or a professional cleaner to cut into the pollen and pull it out of the fibres.
With lily pollen, the best way to prevent stains is to remove the stamens before you bring them into the house.