@ingobecker @jerzone @tinx I use a spray product called Corrosion-X to remove and prevent rust aboard my boat, which lives in a saltwater environment. I think it might be something worth considering for a bike chain or any metal part that is susceptible to rust. It's available in marine stores but it might be available in a good hardware store as well.https://www.corrosionx.com/products/corrosionx?variant=45808527704309