No personal experience of this, the only methods I know of are to replace
the sealed unit, fill the scratches with windscreen repair resin or polish
them out with Ceria (cerium oxide) or Jeweller's rouge (iron oxide).
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.