How can I clean foggy mirrors and make them bright again?

Try vinegar and newspaper

I agree. Vinegar should remove any film on them.

I use windshield washer fluid on glass and mirrors. Works on cars.

I would just wipe them down with some vinegar, should clear them right up!

I agree with using vinegar. It works great.

Mix one-part vinegar with four parts water and pour it into the spray bottle. Spray the solution onto the cotton cloth or directly onto the mirror. Before the spray dries, wipe the mirror from side to side or up and down with the cotton cloth. Never wipe the mirror in circles.