I want to remove the fixed glass panel from this shower cubicle screen. The reason being to clean the unsightly mould between the glass and metal frame behind it. Whoever fitted it didn't think to seal between the glass and frame, so soapy water gets in and sits and goes mouldy. I thought by removing the top and bottom retaining screws, the glass would just pop out of the frame but it's not budging. Any helpful advice will be most gratefully appreciated.

