Before buying new glasses, try applying the following method to make them shine like they did when they were new.
To remove opaque stains from glasses, all you need is the element that has now become fundamental in domestic cleaning: white vinegar.

It is not only used to disinfect surfaces, but is also very useful for eliminating limescale residues from glass surfaces, such as those of our glasses.

Putting the remedy into practice is really simple: fill a container with white vinegar and immerse the glasses (or any other glass object) in it for about 30 minutes.

Finally, wash normally and dry with a cloth: the dull stains will have disappeared and the glasses will have returned to their original shine.