Arctic Silver "Arctic Clean"
 

vailable in three sizes (2,4, and 8 fl oz.)which fit every need (even the 2oz set is plenty for several cleanings), Arctic Clean is a Godsend to anyone who frequently changes their cooling solution. The simple two step process makes cleaning your heatsinks base as simple as possible, while making sure you are getting the very most out of your heat sink's and thermal paste's performance. While most cleaning solutions come with horrible smells, Arctic Clean features a refreshing citrus smell that doesn't kill brain cells.
For a modest price, you can have the peace of mind knowing that the base of your heat sink is as clean as it possibly can be. If you are planning on Lapping a Heat sink, or reapplying the thermal compound on the base of your HSF , then Arctic Clean is a very wise investment.