On Friday, 30 April 2021 at 12:16:46 UTC+1, Brian Gaff (Sofa) wrote:
Yes back in the days of valve tvs, above the TV had a lot of dust and stuff.
My guess in that case was static attracted it, then heat forced it up to the
wall and ceiling.If you have ever opened up an old crt TV after some years,
you will find it deep in muck.

Brian

I suspect that the convection of dry, warm air you might expect round an operating boiler would itself tend to cause a build-up of static. And that would cause exactly the same issues as TVs, ionisers, etc.