I came back right after recess today. The firs thing i did was to take the ladder and vacuum cleaner into the room. I vacuumed the top of the fan blades, opened up the air-cond and sucked it clean. Then, vacuumed the tops of the cupboards too. No more energy for the walls, and ceiling. Will have to leave those for another session. Guess after this, my room's dust level will be down by five zillion counts. Oh yes, the ionizer is on at top speed now. Will further clean up the room's airborne particulate matters in a few hours time. Clean air-cond = colder room. Less dust = healthier living.