It's that time in my PC's life when the fans are held still and I unleash all hell with a can of compressed air again - what do people use/recommend? I've borrowed an air compressor other times, to sensational effect. I can't do that this time. Do cans have enough oomph to get what is frankly, a fairly disgusting PC, clean? And where do people get it? Is 6 quid a can fairly reasonable, or am I going to get through 10 cans doing this?