Getting back to the original problem, cleaning the ceiling. A squegee floor mop using sugar soap or Handee Andy would probably make a good job because you will probably find if you start on a spot the whole ceiling will want washing.
We found these people reasonable for screens etc. not sure if they operate in Northland.
http://www.homeplus.co.nz/security-insect-screens/
Last edited by Gran; 9th April 2013 at 09:27 AM.
I use a portable pocket steam cleaner. No chemical, just steam.
Getting back to the original problem. In the Christchurch area, just wait a few weeks and then sweep it up with the rest of the ceiling :-)