I actually just use liberal amounts of rapeseed oil from the grocery store, usually applied with a $1 paint brush.
Probably not the best, but so far it has worked alright and it does have a few points in its favour. The price not least. And the (lack of) smell. Also it is of course entirely safe for consumption, not irritating to skin and fairly easy to clean so you don't have to watch out as much.
Cheers