How do you clean inside shower glass blocks?

by Sherry

I have a shower with tile. There is no door and it is open with the wall being made of glass blocks.t The glass blocks on the outside of the shower are fine. however, the glass blocks on the inside of the shower have this film over them. I can scrape the residue with my fingernail. anything I have tried to clean it with just goes right back to a film. Any suggestions to get ride of this film and make the glass blocks look like glass and not a filmy residue? Thanks!

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