I would not say in a few days time, i clean my casing once per month on average (or twice or thrice when i am dead bored). and there are not so many dust to wipe actually. but i got a good tendency to see dust here and there stuck on the mesh grill, especially on the larger holes. Get a smaller mosquito net like mesh grill and install it between the fan and the large mesh grill and you are good to go.