Hi - sorry, I felt bad about removing the "verbiage" and replacing it with an unassuming icon, but it keeps the UI cleaner that way.
Navigate to the "Cleaning" maintenance schedule from the roaster details screen. Tap the left button in the bottom toolbar. That creates a new maintenance "Log" ticket. For Behmor cleaning, that's all you really need to do. But, for more in-depth maintenance you could record cost, notes, hours spent, etc.
Once you save that new ticket, the counter will reset. If it were a time-based schedule, you'd be able to reset the start date as well.