How can I attain rid of impossible wet stains? I have a glass shower door and over the years "hose stains"...

I have a glass shower door and over the years "hose stains" have built up on it and it is now impossible to bath off with regular soap and hose.

So what are some good products I can use to get rid of it and manufacture it actually clear?
Answers:    In the US, there is "CLR" (calcium, lime, rust), which is unsophisticatedly just an acid. It works great on this, assuming it's mineral deposits. Lime-away is a similar product. Don't mix it near baking soda, though, as it will neutralize the Limeaway (mixing acid with a base).

Also, hold both products away from stainless steel, as it can damage the surface.
Lime-Away mixed with baking soda. Make a soft mass, apply liberally, let it sit of a few minutes and scrub near a sponge. mr clean magic eraser