Wel I took it out of the cae, and well the only dust on it was in the heat sink
One person suggested to me that I should use a makeup brush but surely that would make huge amounts of static??
My PC is suprisingly very clean indeed, with the only dust settling at the bottom of the case, cleaned that out and it looks brand new
Well happy now!
Thanks for the tips! But I'm going to avoid walking near a swimming pool while carrying my PC.....