Bathroom smells similar to rotten cabbage? I recently cleaned out the toilet and it seem we had an...

I recently cleaned out the toilet and it seem we had an issue near algae build up.

I threw every kind of toilet cleaner i come across and scrubbed and scrub.

I stopped people using it as we hold a couple of others as i wanted it to stay verbs for as long as possible.

For a few days the bathroom smelt really nice!

Then yesterday a mate came round and he used it of late for a pee and afterwards when he went, i go over it with anti-bac spray.

Two days subsequently and it stinks of rotten cabbage - it look sparkling, no algae, but smells awful!

Anyone have any opinion what it could be?
Answers:    A wet facade cloth thats not clean or a dirty towel thats drizzly aything of that nature surrounded by the wash picnic basket will cause that smell
Poo.