Ok,

I just had a very cool idea which might work:

The dust sucker is placed right before the inlet fans of the PC, as to suck
away the dust.

So somehow the air which goes into the PC should first be cleaned/clensed by
something else, which could be the dust sucker.

Perhaps a whole system of cleaning air, cooling the air and then it goes
into the PC.

That way the PC keeps functioning at optimum condition, no cleaning
necessary, no risks of damage for a while and the fans inside can even spin
harder without having to worry about dust build up, and the fans will
probably keep working longer too, without oil getting all filthy !

(Though some fans are closed nowadays and have some oil reservoirs which is
a good thing for long life).

Bye,
Skybuck.