There was a need for a washing vacuum cleaner, but buying is expensive. I remembered that I have a KARCHER WD 3, which can absorb water (do not waste time and money, you just ruin an ordinary vacuum cleaner), but cannot spray a cleaning agent. Therefore searching in the garage found a washer reservoir from a Lada with a pump, a tube, power. I also had to buy just such a nozzle for a washing vacuum cleaner
I recommend making power from 18650 batteries connected in series. So there will be less wires and problems. So in the nearest stores these batteries were not there, I decided to use the old power supply from the computer. At the same time, 12 volts appeared in the garage.
The first attempts to wash something already paid off. Now do dry cleaning.