Unusual patterns on ceiling

[hrxv1]

Hello

I am trying to find out what has caused these small circular shapes on my guest toilet's ceiling. Is it water damage or from some cleaning or steaming that was done on the wall tiles?

Thank you.

 

[snowhead]

I'd say condensation or water spray to do with the tiles being cleaned.
There's a fairly constistant space on the ceiling from the wall to the marks, that'll be the depth of the cleaning / steaming device.

 

[PETE 123]

Fizzy beer cans being opened underneath whilst sitting in chair.

 

[cjg]

(told you not to shake to hard) steam condencing on roof

 

[Chuck]

That's a remarkable phenomenon.

My guess is that your steam cleaning left a droplet of condensation/spray at the centre of each circular mark. This then soaked into the slightly porous ceiling and then spread out transporting stain from the plasterboard outwards and depositing it at the point the water evaporated. 'Coffee mug stains' form in a similar manner.

I'd deal with it by waiting to make sure it's dry, which could take a several months, then slap on a layer of 'one coat stain stop', and then repaint the ceiling.