Model Airplane News around 1991 printed a cleaner you can make at home and is real cheap, I've used it for years and it works great. Use 1 tablespoon of liquid car wash, 1 tablespoon Armorall, and 8 ounces water mixed in a spray bottle. Spray on and wipe off. Be carefull with alcohol, windex,amonia,and clorine as they can harm our film covering and glue joints over time. I've seen it happen to friends planes. Dan