Here’s a great product to make your shower screen shine like new! Watch the video, no chemicals. The only trouble is that it wont get into the difficult corners of the aluminium frame. Try some creme cleanser and an old (or someone else’s ) toothbrush for those areas.
If you find black or brown marks on the OUTSIDE of your screen, or on the skirts or walls, then you have a leak. Time to get serious because you could be doing STRUCTURAL DAMAGE to your home’s timber frame.