Removing Salt Water Stains from Boat Windows

My son-in-law, who is the captain of a very expensive deep sea fishing boat cleans his entire boat with vinegar. The boat is fiberglass, but has real glass windows. He salt water fishes every day and says that the vinegar gets the "baked in" stains out!
Polly G from Turtle Creek

Most boat windows are plexi-glass. Glass cleaners are not to be used on them. Try lemon pledge. It does wonders.