Cleaning Smoke Alarms

Follow these steps when cleaning alarms:

1. Turn off the mains power to the alarm – green light should go out
2. With the thin nozzle attachment, vacuum around the vents

 

3. Clean the cover using a damp cloth. Dry with a lint free cloth
4. Turn the mains power back on – green light should be on


Alternatively, using a hairdryer on its coolest setting, blow out all the grooves and vents on the alarm then repeat the above steps.

found at http://www.aico.co.uk/How-do-I-maintain-alarms.html

 simple :)