noob here with broken philco

[Donny]

I've cleaned on it some with it being in a kitchen 15years I have a slight cooking grease problem! I really don't want to damage the looks of the unit so I haven't taken it apart yet I pulled on the knobs I don't think they want to come off!!! these have a set screw or a clip holding them on? Oh I have no Idea what I'm doing this might be to nice a radio to be working on myself I gave away a big philco about a year ago I should have tried repairing it but it was in horrible shape it fell apart loading it!!!