~ Do at your own risk ~
I recently used some compressed air to clean layers of dust inside my computer....dust caked components.
Wanted to limit dust-intake for the future.... Sourced fabric I believe makes a reasonable dust-filter, whilst - in my opinion - still allowing PCU and graphics card fan to get enough cool air (for location of my computer in colder UK). Not the most tidy of work... covered air intakes/outflow areas of computer.
Step 1: Step 1: Dust Filter Materials (possible Options)
The dettol cleansing wipes dry out quite quickly, and a bit thicker material than the tumble-drier sheets. I used a mix of both, to act as dust-filters.
Step 2: Step 2: Low Energy Dust Attractor
Also wanted a low-energy "dust-trap". Didn't want to run an expensive 40w Air Purifier (electricity running costs add up over time). Was looking for something which 'may' (yet to be proven.. I've only just set it up) attract dust around the computer area.. to trap dust. Bought a cheap 'LAPTOP COOLER STAND 2 LARGE FANS TILT FOR 15 17" INCH LAPTOP COOLING PAD'. - I don't know the power-consumption exactly (from USB)... a guess would be 1.8-2.4W.... anyway it's massively less than a 40w air purifier. I am hoping it's powerful enough to intercept quite a lot of dust.
There was quite a few extra holes in the lap-top fan cooler (on the sides and back) which I covered up with tape, and then added more fabric 'filters' to the fan exits, to prevent dust being blown back out into the room.