I`ll check that in the next few days when my heat transfer paste "arctic mx2", which I bought precautiously, has arrived.
I do it like this:
1. Try to remove only the case and clean the fins. If possible check the sound and heat after that.
2. If heat and sound are still to high or the case isn`t removeable seperately I`ll remove the whole cooler, renew the heat transfer paste and check the performance again.