For gum removal, I bought a steam producing vacuum some years ago. Great for gum removal some "light " curtain cleaning, but useless for carpet cleaning.
My wife bought one of these little steamers for laminated and tiled floors last week, it does a good job at that, but they claim it will clean carpets.
Steam is more likely to wreck carpets, than clean them, 'tho I must admit, there has been the odd occasion when I felt a "steam genny" would be the answer to a really grotty commercial carpet.
robert m
Joe
I have tried steamers over the years and as you say, with a cloth / towelling strip between the carpet and the steam head................as they dont use chemicals, the results are inferior to the standard regime, of, spray/aggitate/hot water extract.