Spec me a de-icer

[Jonnycoupe]

So there is no benefit in holding the revs up a little while the screen clears?

Well that's coolant. And yes, preferable to either running at idle or driving blind.

I fast idle and dial in some regen (manual command of the electric motor in my hybrid - about 4kW) so the waste heat is similar to a kettle to load the engine and warm the battery