Glass ?

[dfish28]

So we are splashed now!!!!! Yes!!

But we got the boat with a windshield that looks like the saltwater was allowed to bake in the sun for a while, long while, and seems it "etched" out spots in it, way beyond any elbow grease and a towel.

My question is has anyone come across this and what was your solution, I'm thinking some kind of really fine wet sanding or aggressive polish that isn't going to haze over the glass...
That's my dilemma now. Thanks in advance for any info!