I recently bought a Winchester model 70 classic stainless and would like to clean it up a bit. It has a few small scratches on the bottom metal and trigger guard along with what looks like normal hunting grime. Is there any product that works well for cleaning up the outside of the barrel and bottom metal that won't be detrimental to the stainless finish? I've googled it and come up with a few possibilities but would like to hear some first hand experiences. Thanks.