Another vote for cleaning it.
Half the time it's just goo on the inside of the windscreen refracting the incoming light and making it glare.
I've found the best thing for it is neat washing up liquid, a couple of drops on a rag and smear it all over - then buff it clear.
It cleans the windscreen up and acts as an anti-misting agent, so your windscreen doesn't fog up on cold winter mornings
Half the time it's just goo on the inside of the windscreen refracting the incoming light and making it glare.
I've found the best thing for it is neat washing up liquid, a couple of drops on a rag and smear it all over - then buff it clear.
It cleans the windscreen up and acts as an anti-misting agent, so your windscreen doesn't fog up on cold winter mornings