Review (3/5): Oral Irrigator?  Presssure washer?
Because of the small tank, the stream is tighter and faster. That's uncomfortable. The tank needs to be filled often. The unit needs to be kept vertical, especially when the water in the tank is lower. Debris can collect on the unit making necessary a good rinse every time. I will stay with the larger plug-in unit for daily dental care.
I used the unit to blast away some crud that developed around the corners of my bathroom floor and around faucet handles. It worked like a champ.