On all the machines I’ve had I have never had to adjust the tension on the pulley head.
The drive cable will come off easily, but getting it back on again is sometimes easy, sometimes more fiddly.
Just saying because some people will prefer not to undo the tension each time.
Also, the various liquid cleaners are OK if the fan is not too mucky, but as a bulk cutter of MDF/Draftboard I’ve found that fan gets very gunky and actually needs a good scrape out.
The scoop where the air gets blown out also gets clogged up to and you might need to unscrew that plate (with the same hex key) to get what is clogged up underneath.
I no longer use any of the liquid/spray cleaners - I think they to tend to make the fan sticky and are not very good at cleaning.
All that said, I think a lot depends on what you are actually cutting and how often you clean that head as to what works best for cleaning - I’m glad there are many ways - because sooner or later we are all going to have to try something different.
See this about how to clean the scoop