Bath not cleaned for 6 months

[JinglingAllTheWay]

It needs to be cleaned and there's no way I'm letting my dc bath in there without cleaning. We are staying for part of half term In the house and I'm going to have to clean it. The shower curtain and bath mat have an orange tinge, I'm guessing it's some sort of bacteria? I asked when the bath was last cleaned and he said 6 months ago

All round the sealant looks damp and blackish in places.

What do I clean it with?

I have to confess... I went and bought a new shower curtain and may! I will leave the white ones washed so he can always change it back but these were cheap and look nice so fingers crossed he won't mind!

Mat*

I don't think I've cleaned the bath in 6 months it doesn't look dirty...

I was going to say the orange stuff could be limescale related because we used to get it in our old house, but actually it was more pink than that. It would be there even though that bathroom was less cold and used to get cleaned regularly.