I think something like this comes up every winter when you're putting the baby to bed. I favour running the engine up at least every two weeks, but if you're letting it lie for longer or removing the charger spray down the inlet with stuff called lay up oil; one called ROK OIL comes to mind. This covers the internals with a sticky protective coating which can last for a couple of years. People lay up outboard motors costing tens of thousands using this stuff, your charger will be OK with it.
