This week I have been fortunate to buy my first Epiphone electric guitar. A secondhand SG Vintage G-400 in Worn Cherry. I am very pleased with the build quality and the guitar in general. On the front of the instrument the previous owner left a slight discoloration in the area of the tone knobs. Very carefully, I used an anti-static (mild) liquid to try and remove these marks. But, I stopped quickly for fear that I was removing the top layer of the Worn Cherry finish; and, I was in danger of ruining the appearance of the guitar. Please, does anyone have any advice as to what product I can use that wont take-off the top surface of the finish. I wish to retain the Worn Cherry look overall.