The only thing I could find around my house that was pure alcohol is spiritus. It contains 96% alcohol, would that be a "effective" method to clean my CPU and heatsink with? And in general, is spiritus safe to use to clean thermal paste?
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I would use rubbing alcohol which you put on an area of skin before a shot. That's the best and it only costs 99 cents to $1.00 depending on where you go.
I agree with previous poster, you can pick up some rubbing alcohol at almost any local store for a dollar or two. Personally, I also like to use acetone to clean off thermal paste and then use alcohol.