Your current combo robot vacuum and mop may not be the cleaning whiz you think it is, but iRobot is hoping to replace it with its new Roomba Combo j9+. Combo models — which pair a vacuum cleaner with a deployable wet mop system — have been sailing up the robo-vac sales charts in recent years because of their flexibility to clean just about any room in the house. For anybody who grew up watching The Jetsons in eager
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