As the man said, High Standard Flite King. Good shotguns. To clean, CLEAR the shotgun. Schematic for you-http://www.gunpartscorp.com/catalog/Products.aspx?catid=8501
You can use a mop/brush solvent on the barrel. Removing #72 (looks like a screw) will allow you to remove trigger group. DO NOT TAKE THAT APART UNLESS YOU HAVE LARGE ASSORTMENT OF PROFANITY. Use spray gunscrubber to flush out dirt, let dry, oil lightly, replace.
The pumps require minimal maintenance. Wipe outside down with a lightly oiled rag, drop of oil on action bar.