I like to Clean my guns especially new purchases. we use an old battery operated ROTARY toothbrush with wd40 as a cleaning agent. This solvent is mild and cleans the grease , grime and worn in dirt out of the engraving as well as the screw slots leaving your gun CLEAN and sparkling without damaging the finish.
try it on a small area and buff with soft terry cloth.
I know you will be happy with this method as it really works great.
good luck
Legh Higgins