Glad to see you are home and hopefully on the mend. If that gun has a light coat of rust on it. Go ahead and use #0000 steel wool and a light gun oil. If you use light pressure it will not remove any bluing.
You said Winchester 90, are you referring to a Winchester 1890 slide action rifle in 22 rimfire caliber. If you are, be very careful about any cleanup job. I would just clean any rust off and nothing else. They have high collector value and can go from 1,000 dollars to 3500 dollars if in NRA good condition. The high end is one with a case harden frame. If it has a nickel steel barrel, the price goes up over those figures I gave you.
RELH