In article ,
The Medway Handyman wrote:

Yup. Ended up having to redocorate the room as a result. The really,
really fine dust gets into the texture of the paint and won't wash
off without putting a seriously odd looking 'shine' on the paint.

Ah. They tried to wash it off & made it look worse. Does another coat of
emulsion cover it up?

Yep. (IME)

I've found that the Dulux "real life" emulsion is much better. Can be really
scrubbed at without going shiny or losing all of it's pigment.

Ioniser was binned. Never again.

Thats what they have done :-)

Heh, I think mine helps so I've lived with it. Probably in my mind really
but...

Darren