I have a question since the author is around:

My sensor was working fine for a few months. It’s located near the area I smoke, so whenever I’m smoking it changes to red quickly. And after a few minutes (10 or so) it’d go back to green.

But for past few weeks it’s stuck at red. I disassembled it and cleaned the intake hole (which is covered with a fabric) and it worked after. However it went back to displaying red again all the time.

So my question is whether this sensor needs frequent cleaning? If so what are the alternatives?