Jet washing is a great way to cut down the labor time of doing your patio by hand, however, some risks come with it. The pressure of the water can cause surface degradation and can also lift the joint paving or the sand out, so you shouldn’t spray for too long on one area.
If you’ve got a really old patio, then we’d recommend using the manual techniques to keep the patio clean but without damaging the structure of it as it might be fragile.
However, if your patio is relatively new and in prime condition, then you can use your jet wash on it a maximum of twice a year to keep it looking clean but also in strong condition.