Here are the steps for you to take to clean the salt water off your sunglasses.
First of all, you need to soak your sunglasses in lukewarm water.
Next, rub some soap to your sunglasses. Wipe it thoroughly.
Then, flush the sunglasses with water and wash away the bubbles.
Finally, dry them with a piece of clean cotton cloth.
The salt water may have the chemical reaction with your frames of sunglasses. You should use the clean water to wash the sunglasses until you find it clean. Then you could use the clean cloth to dry it and let it exposure under the sun. It is easy and simple. You could have a try.
Well, generally speaking, it is actually kind of annoying to have salt water over sunglasses. What is more, salt water can just be harmful your sunglasses. So you need to take some measures to remove it off. First, you should prepare undiluted white distilled vinegar, for it can be good for removing salt water over sunglasses. And then, you can just soak the glass item in the white vinegar for a while. And then, just use some soft cloth with vinegar to wipe the glass. Of course, you should do this very carefully, so that it will not hurt your sunglasses. Finally, just dry the glass piece with a lint-free cloth. Anyway, just take care of your sunglasses to avoid being unclean, or scratched.