It appears there is still a shortage on the 3M Novec Electronic Degreaser. I can’t even find it on Amazon. When I search for the 3M product this comes up. https://a.co/d/7TBF25c
I bought a can of Novec a while ago but so far the only time I’ve cleaned my fan was just by swabbing it out from the back and vacuuming. Mainly because I don’t want to use it indoors and it’s too much trouble to move the Glowforge.
I haven’t seen a lot of positive stories about it working well either, so I’m a little apprehensive to have it cause a bigger mess. I guess my light usage keeps the fan relatively clean.
Nobody is going to give you the all-clear to use some other random product, because who knows what it will do? It might not be compatible with some of the materials in the machine. You don’t want to start dissolving the plastic or corroding a connection. You can take the manufacturer (the amazingly named buhmwoo.com, whose web site isn’t even functioning as I type this)'s word for it that it’s “safe for all …” but it’s up to you to make that call.
From a look at the data sheets, buhmwoo-100 and 3M Novec use completely different ingredients.