Sorry, but your question really made me laugh! You are supposed to swallow your greens - as Mum used to say! You also said you use a tongue 'scrapper' I do hope you meant scraper. If you really did use a scrapper it certainly wouldn't come back & neither would your tongue, he he!
Does it go away when you bruch your teeth? It might just be stuff that builds up in your mouth overnight.
It's probably bacteria of some sort, so you could try gargling (did i spell that right? You know what I mean though?) with salty water. Its really good for getting rid of infection and germs. If that doesn't work just head to the doctors and get it cleared up. If it is as persistant as you say mouthwash and a tongue scraper won't help.