Glyphosphate?
Glyphosate won’t help with moss because moss doesn’t have roots, and glyphosate works by translocating to the roots.
If you want a chemical, use ferrous sulphate aka “lawn sand” (you don’t need the fertiliser that lawn sand also contains) but beware of the possibility of brown staining.
Or just scrape / wash it off. Elbow grease may be required!

