How on earth are you meant to clean a shower with a fixed head rather than a hose. If you use any cleaning product, you can't rinse the tiles properly without chucking a jug of water at them and then you get soaked with the splash back. Shower head itself is covered in limescale which again can't put any product on and rinse off.
Use a squeegee every day, but the stupid doors overlap by about an inch when fully extended so there is an opaque stripe of limescale/water marks.