Welcome to the board YB. Here is a website that will help you find out what arsenal and series you have.
http://www.gunboards.com/sites/banzai/DataSheets/M99/M99Data.htm#Model_99
If you have an early series, the bore will be chrome lined, later they weren't. Clean the bore as you would any rifle. I wipe down everything with rubbing alcohol to get the old grime and grease off.
If the stock has not been "messed with" (sanded, scraped or refinished with something), the original finish is Urishi. A type of lacquer made from the sumac plant. (There is an interesting story about Urishi on the Banzai website.) If it's the original finish, clean it, but leave it alone.
I wipe down all the metal parts with a product called Eezox. It protects the metal from rust.
Let us know what you have.
Dean (the other one)
http://www.gunboards.com/sites/banzai/DataSheets/M99/M99Data.htm#Model_99
If you have an early series, the bore will be chrome lined, later they weren't. Clean the bore as you would any rifle. I wipe down everything with rubbing alcohol to get the old grime and grease off.
If the stock has not been "messed with" (sanded, scraped or refinished with something), the original finish is Urishi. A type of lacquer made from the sumac plant. (There is an interesting story about Urishi on the Banzai website.) If it's the original finish, clean it, but leave it alone.
I wipe down all the metal parts with a product called Eezox. It protects the metal from rust.
Let us know what you have.
Dean (the other one)