I have a '72 nitro finished Gibson that hasn't been fully cleaned in the 18 years I've had it, and it's anyone's guess how long before that. The broad consensus seems to be soft cotton rags, damp with water, and then graduate to naphtha if needed. Neither is working for me, and the film just gets shoved around the surface, with very little transferring to the cloth. Some also say distilled white vinegar is OK, which I haven't tried yet. Some also say mild detergent, but that's usually petroleum based, so I'm wary of that. Then again, so is naphtha. One thing I'm curious about is unscented castile soap. I have some unscented Bronner's that I could try if there's no objection, but I can't find ANY reference to its use in all of google-dom. Here are the ingredients: Water, Organic Coconut Oil, Potassium Hydroxide*, Organic Palm Kernel Oil, Organic Olive Oil, Organic Hemp Oil, Organic Jojoba Oil, Citric Acid, Tocopherol * None remains after saponifying oils into soap & glycerin. I also saw mention of nearly undiluted Simple Green, but I couldn't make out if the finish in question was nitro. Its ingredients (includes Ethoxylated Alcohol - bad?): Water, Ethoxylated Alcohol, Sodium Citrate, Tetrasodium N,N-bis(carboxymethyl)-L-glutamate, Sodium carbonate, Citric Acid, Isothiazolinone mixture, Colorant, Fragrance I'd love to give it a safe and effective cleaning that still gives me a little time to play the damn thing before I croak. If naphtha (or maybe OMS?) is the only answer, I will spend hours shoving around grime in a toxic cloud, end up with a hazy finish anyway, and die before I can play another note. I pray to the Great Science in the Sky that there is a safe and effective alternative! Especially if that alternative is already in my home and doesn't require a special order of Virtuoso Cleaner! Any chemists in the house?