Some family friends had a piano they no longer wanted, so they gave it to us.

It is a compact model, Melodigrand brand, made in the USA probably sometime in the 50's, based on the"Los Angeles 24, Calif." label. It's in pretty good shape, although it's dirty from spending a few years in a garage.
Specifically, what kind of cleanser should be used to get the ivories sparkling, assuming the keys are made of ivory?