If you really want to tackle it there is really only one way to do it. Take everything out onto landing/other bedrooms. You have the choice of -throwing it out -giving it away/freecycling it -finding a home for it somewhere else in the house -putting it back in the spare room But, only put back what you really need to keep. As for the carpet, you can clean it or buy a big rug from somewhere like Lidl, or Poundstretcher for the same price as a carpet cleaner.
After you fill the bag of "this might come in handy one day/I don't want to throw this out/I am sure the other half of this piece of crap useful object is in the house somewhere and one day we will need it" then tie the top up, and bin that one too - you don't need any of it!! (Think of me as one milimetre off being Mrs. Trebus here... sighhhhhh)