I never buy that stuff, I've only heard bad things. To clean strings I just use a dilutant of water and rubbing alcohol, then let it dry for about 10 minutes. Strings sound brand new after that. To clean the fret board I just use a dry or semi-wet rag. Since most of it is just dirt and oil. Works well for me. Don't use alcohol or furniture cleaner, heard bad stuff about that too. A good idea is to keep a dry rag in your case at all times, and everytime after you play just wipe down your guitar.