[HoovDaddy]

If you can feel them with your finger nail they are likely too deep. Othewise what works for me is, 2 or 3 applications of Meguiars Fine Cut Cleaner using a yellow, blue, or white microfiber towel. Follow that with a couple applications of Meguiars #3 Machine Glaze with the same towel a couple times. It will look like new. There are probably a hundred other ways, but that is a rare lens and you need to be careful. I always have these polishes on hand for paint work, so I utilize them.