Hi everyone,
I am trying to find a way to clean the black mould from our shower screen. It is in the seal between the glass and the frame

It looks like the seal is one piece that's been wedged in rather than some sort of silicone caulking etc. Here is what it looks like at the top clean

Is there a product that cleans this, or if I have to remove it can I just cut out the bottom and what do I replace it with?
Thanks