Buy thermal paste cleaners If you want peace of mind. Or you can use Mr Muscle Kitchen Cleaner if you already have it in your home. Thermal paste cleaners smell like oranges and lemons to me... so they must have some d-limonene. As d-limonene is used in many cleaners, you can buy it separately for other cleaning purposes at well.
So, wipe off the excess paste with something containing d-limonene and then finish off with IPA 99%.