Re: Refinishing hardwood floors
BloodSweatandPigsEars -- I agree it all depends on what look you are willing to accept and depends on what and how bad the stains are.
Also, depends on the spieces of wood.
A certain amount of imperfections and stains can add character and petina to refinished floors unless you want a pristine contempory look.
Like jkirk posted --- sanding the floor until you reach an acceptable look or replacing the floor are really the options.
"" an ounce of perception -- a pound of obscure "