isopropanol alcohol will do, get the 91% + stuff. I like denatured alcohol as it lasts a little longer in the bore. They both dry out nicely and leave the bore free of moisture. No need for any solvent, even windex is mostly water and will not fully remove moisture, plus it bubbles up and leaves a mess in the breech. Plus alcohol is cheap. Also as pointed out above, some cleaners will harm your stock finish. Alcohol has never turn anything I've owned.