Hello anonymous
That can't really be answered, because various factors play a role here. On the one hand, the strength of the spray, the duration and intensity of the cleaning, the size of the surface and, of course, the dosage of the cleaning solution itself. It is recommended not to add more than 6 caps of the cleaning solution to the water in the tank. Please excuse us for not being able to give you more precise information on this.
Best regards,
Your iRobot Team