After you've had the robovac go over your home with a fine-toothed comb to pick up the dirt, you can return with the mop, which uses real-time clean water spray to rinse the mop as it cleans to avoid cross-contamination. It also uses smart fluffing to better help maintain the mop, so it doesn't get dingy and old as time wears on to ruin its performance.
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Customers had to pay a deposit for the sturdy glass bottles. They then got this money back when they returned them to the shop. And the bottles would be washed and refilled over and over again.