The best replacement for shampooing is steam cleaning.

The best alternatives to shampooing are rated as following:
★★★★★  steam cleaning
★★★★  steam cleaning carpet
★★★  steam cleaning carpets
★★★  steam cleaning a carpet
★★  steaming carpets
★  steaming

Your alternative for shampooing is not listed? Suggest!
Speaking about shampooing, one probably shouldn't forget about conditioning.

Other search terms related to shampooing and their ratings are:
★★★★★ conditioning
You have in mind a companion for shampooing and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of shampooing in all years. Click on graph for more.
shampooing
steam cleaning
steam cleaning carpet