On Nov 11, 3:36*pm, "john east" wrote:
Have an ordinary house smoke alarm. *It's about twenty years old and it has
recently gone off in the middle of the night for two days running and for no
apparent reason.

I've heard that it might need a vacuum cleaner applied to it. *Is there
likely any truth in that, or is there anything else i might usefully do?

Or does it probably mean that I have to replace it?

clean it out, fit new battery, see if it behaves. I dont think theres
much else one can do with them. Except build a nuclear power plant...
google radioactive boy scout.


NT