Just pickup one of the many guitar restoring/cleaning kits made by Fender, Gibson, etc. and follow the instructions on each bottle. 1.2" is within .003 of 1 13/64" on a steel rule. I use denatured alcohol on the fretboard with a very coarse rag. Terrycloth towels work well. Make sure you don't use too much. A soaked rag is too much and might leach oils out of the wood. Hand polishing with a very clean, soft rag is about the most rewarding method for an overall shine. IMHO. Shiny ROCKS!