Ya, try the hydrogen peroxide [H202], as recomended above,
Keep trying it for three days, three times a day. Leave it on the tongue for several minutes if it is not "burning". Rinse it and do it again if it burns, thats just the H202 working on some bad stuff, spit it out and do it again. Burning is good actually, just don't push it too far, its not dangerous though,I gaurnatee that, yes I do.
Then , and this is really helpfull - use BAKING SODA on a toothbrush to SCRAPE the tongue [forwards, then spit it out]. Put more H202 on the tongue, more soda, do it again, three times.
That will definately leave your tongue nice and pink!! It is not a nice taste, but so what, a few minutes.