Well, well, according to the newspaper, you should start house cleaning (Here in Japan in December is the season of general house cleaning not spring cleaning. Because I think, in December we don't have much pollen, we don't have much rain even though it's really cold.) from this month little by little ( for senior people.)
I think it's a good idea.
What people usually do?
Cleaning conditioners, cleaning the kitchen stove and a kitchen ventilating fan, and cleaning the bath room and cleaning the windows.
In our case, we usually do cleaning the windows.
(we often skip cleaning conditioners and ventilating fan.)
This house is old, so compared with current houses, we have more windows.
And -- if we were too old to clean the windows ---
I looked up the cost on the net.
It costs 400 yen a pair of large windows currently.
well, well, additionally, it costs at least 12000yen to clean an air conditioner, and it costs also 12000 yen to clean a ventilating fan.