Will carpet cleaning remove old stains?

Old stains lift depending on what they are, how deep they've set, and whether prior spot-cleaners left residue behind. Hot-water extraction lifts most water-soluble stains completely. Set-in oil, dye, and rust often require a spot pre-treatment or specialty step. At pre-inspection we walk each stain with you and set expectations before the extraction pass, so you know which spots will fully lift and which will only lighten.