How do you properly clean a shower cubicle?

[Rumineverything]

Hi,

Just this really. It's not so much the glass that I struggle with, it's the bits you can't really get to - behind where the doors slides back and forth. It's looking almost rusty 😬 but I just can't get to it!

Any tips?

TIA

I find dental brushes are very helpful when cleaning e.g. denture brushes, long interdental brushes and toothbrushes