Hitorigurashi no OL o Egakimashita - Vol. 4 Ch. 11 - Day 95 Office Lady Who Lives Alone Having Dusty Air Blown at Her from the AC.

[MangaDex]

 

[Yankun]

You can call for professionals at times like this. Really.
If I'd do it myself, the thing is going to be so damn wet that it might break the whole machine so naturally, I would avoid that.