To remove the old cooler .
Start computer run prime 95 for about 5 minutes to heat the CPU amd TIM.
turn off computer .
Undo the clips.
Gently twist the cooler clockwise then counter clockwise a few times.
Lift off cooler.
Clean thoroughly with 70% isopropal alcohol and a lint free cloth.
I was under the impression that you have to use 90 percent isopropal alcohol or does that not matter?