Cleaning glass on light fixtures

[Kona]

Need to change out my bulbs on my belize sun light fixture, and have salt water burnt on the glass over the mh's. I was wondering what people do to get rid of the salt stain on their glass. i have tried using vinegar and water and wiping it off, but doesnt really get all of it off. i plan on removing the glass and soaking it in hot water, and wiping it clean with a cloth,or should i use a sos pad or razor blade to get it off? Any thoughts would be helpful