Wear gloves to protect your skin from the liquid metal.

If you have a disposable syringe, you can use it to suck up any large pools of liquid metal. Don't use the syringe containing your new liquid metal.

Starting with the heatsink: apply a few drops of highly-concentrated (greater than 90%) isopropyl alcohol to a cotton swab and carefully clean up all of the liquid metal from the heatsink surface.

Removing the liquid metal can be tricky—it spreads and smears easily. Switch to new cotton swabs and apply more alcohol as necessary.

Use the same cleaning process to thoroughly clean up all of the liquid metal residue.

The surface needs to be completely clean for the new liquid metal to work properly.

Let the heatsink dry completely.