100 years of grime. Cleaning advice?

Hey everyone I was gifted this piano but it is filthy. I pulled black paper towel after black paper towel just trying to wipe down the top. Does anyone have any advice on how to de-grime this thing?

Thanks!

Hey everyone I was gifted this piano but it is filthy. I pulled black paper towel after black paper towel just trying to wipe down the top. Does anyone have any advice on how to de-grime this thing?

Thanks!