Water and electric are never a good mix . You are completely independent with a petrol or diesel machine (apart from water) These types of machine make the job profitable. Electric ones generally are a waste of time.
Just use the clients then.
You shouldn't even be using a PW on those tiles. Stating you are a professional company and the PW'ing that floor is a contradiction of terms. Furthermore the biscuit coloured encaustics were still filthy and ingrained with dirt.Kev Martin