Cleaning an old pitcher pump?

I just inherited an old pitcher pump. It needs one bolt but works fine otherwise. My issue is with all the grease and grime on it . as far as i know it hasn't been used in the past twenty years and has knocked around garages and barns sense it was decommissioned. There is a lot of visible grease and grime on it . knowing my family someone could have lubed it with axle grease or worse.... so my question is what would i use to clean it up like new? should i remove the gasket before i use the a cleaner? lastly  what should be used for a lubricant on a pump that i and my friends will be drinking out of ?

I would use olive or colza oil if I needed to on such a pump
Best of luck with the cleaning . I would remove the gasket first and clean but not let it dry out .

David