I used my invaluable little Bissell portable, which is very similar to this currently available model: https://www.bissell.com/little-green...-cleaner-14259

Perhaps I should clarify though: I used the word "steam" since it's commonly associated with any form of carpet cleaning, but my little unit only heats the water vs. boiling it. That said, I couldn't imagine having dogs, kids, or used vehicles without one.

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Stablemates:
BMW: '01 e39 M5, '01 e53 X5, '90 e34 535iT, '70 R75/5
Mercedes Benz: '87 r107 560SL, '84 w126 300SD
Volkswagen: '11 SportWagen TDI <- Wife's car
Ford: '04 F-150
AM General: '87 M35A2C Deuce-and-a-Half
Packard: '28 5-26 Sedan