I found it! The company is Finecto and the product is Fincto+ Protect. It’s used on horses in the winter for mites and in the summer for sweet itch. It’s also used on birds.
https://www.finecto.com/en-gb/products/finecto-protect-1000-ml/
Finecto+ Protect is a sticky spray containing small particles of silicon dioxide. When juvenile red mites walk over a sprayed surface, their abdomens are torn open and they dry out. This way, they are eliminated before they can reach the chickens. Finecto+ consists only of natural components. The hens and birds can remain in the chicken coop during the treatment. The product is naturally degradable and as a result it is not a pollutant. By spraying into the environment / cage every 5 to 6 weeks you keep the mites outside. It can also be used to spray onto horses in the winter with mites and in the summer with sweet itch.