I'm surprised no one has mentioned the recent post "Matching malts" where we have the argument for NOT cleansing your palate. I typically drink two different whiskys during an evening session by the fire. Usually the first is a non-, or lightly, peated scotch. Following this, I go to a peated scotch and, for me, and for Jill, and apparently for a few others, we experience enhanced complexity. Then moving from, say, Ardbeg to perhaps Highland Park there is often (not always) an enhancement of flavours--never a diminution. So then, what I "cleanse" my palate with is scotch.