I don't know anything about this but here is the user's manual and it says that it needs to be cleaned wih vinegar and water. If you haven't read this already maybe it will help. 
http://www.chauvetlighting.com/products/manuals/F-1250_UserGuide.pdf
http://www.chauvetlighting.com/products/manuals/F-1250_UserGuide.pdf