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Summer. Father's Day. Dad must be firing up the grill. Grillbot is a must-add tool to dad's backyard domain. Grillbot will automatically clean any gas or charcoal grill, whether the grill is hot (up to 250 degrees) or cold. Grillbot takes between 10-30 minutes to clean a grill and can be programmed to perform a light or deep cleaning depending on how dirty your grill grates are.