Pocket Watches For Sale

Red / pink residue forms around seals in bath - what is it?

I recently bought a new bathroom suite and had it installed, it's a white bath with shower screen. When it hasnt been cleaned for a while a film of reddish pink residue forms around the sides and in the plastic skirt at the bottom of the glass screen door. I initially thought it could be the sealant reacting with something but it even occurs on the tile grout where there is no silicone sealant. It comes off easily and is a good indicator that things need cleaned, but it's annoying as inevitably there's some you cant get at but can still see, eg around the base of taps. Anyone else notice this?

I get it too, I think it's a type of mould.
I just clean it off with some bleach.
I also notice it sometimes around the base of taps and around the base of the caps that cover the screws holding the shower cubicle together.

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