Hi, our shower screen has some horrible marks all over, it. I've attached a (rubbish) photo. It looks like it's covered in drip marks when it's dry; it actually looks better when it's wet! What can I use to clean it? I've tried the following:
Lemon juice, with and without baking powder
Vinegar, with and without baking powder
Glass cleaner
Limescale remover
Cream cleaner
Bathroom cleaner
All purpose cleaner
And none of them have touched it. What am I doing wrong?