Thanks again to everyone for great input. What a wonderful resource, this list. Let me resume. For cleaning Ivory keytops : 1° clean rag under hot water, with soap. 2° baby wipes a bit dried 3° barely damp washcloth with toothpaste 4° Windex diluted in water spray 5° solution of 1/2 water, 1/2 ammonia 6° Dow bathroom cleaner 7° 100 grit sandpaper, solution of 40 % H2O2 in the sun, then fine sand and buffing wheel. For other keytops : 1° Fantastic applied to the cloth (but features industrial strength perfume) 2° Cory Key Brite 3° 409, Simply green Special recommandation : keep moisture away from water soluble glue joints. For key wood : 1° 80 grit sandpaper, one way brushing action 2° scraper or razor blade, used softly 3° disk sander 4° Fantastic (again) 5° rub with 60 grit sandpaper, use felt belts and ivory polishing compound on belt sander. Thanks again to all. I am sure this helps (me certainly). Best regards, Stéphane Collin.
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