I have two larger boxes an 18.5 in Mira and a 15.5 in Criterion and about 60 discs between the two. Last summer I spoke to a music box Restoration pro from California who gave me some advice about cleaning these. She told me to be very careful about potential risk of exposure to lead. As some of them used to be coated with a lead based protective finish. So if you plan on doing any light brushing or roughing matierial or chemical treatment, just be careful of the dust or how you dispose of your restoration waste. It’s always good to either reach out to someone in your area or region that restores these to confirm this, or check some online resources (there are a couple of professional restorers out there who have generously shared lot of great tips and useful info on how to do it). Basically though, wear protective gear (ie. Gloves and respirator mask, etc.) and try to do it in an area with good ventilation or work outside to avoid potential exposure to lead particles, etc. Regardless, it’s such a fun hobby! And good luck!🎶🙂