The Vaccum is made of plastic and isnt really going to touch the case.
I cant get a can of air.

If you don't know where to buy a can of compressed air go to the pet shop. Theres this thing called "pet corrector" and it has loads of air in it to scare your cats/dogs when they are fighting. I use it for my pets and I guess it would be alright for your PC?
Because the dust might be stressing the ball bearing inside the motor thus creating an unusual noise
Or it could actually be that your fan is knackerd and you need to buy a new one,
lol at that, it's sold where I work. That's crap for compressed air, it's designed to make a sound, little air is directional.
What my mum usually does it opens the side up and sticks a hoover inJust make sure you're not knocking any important components, it's safe
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Maplins sell things like that...
Surely you have a maplins near by?
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