After several weeks lockdown, poor Yeti is filthy; a mixture of dust, bird droppings and miscellaneous debris is all over it. Due to health problems (I can't do anything too strenuous) I normally have the cars washed at Tescos..... but am not able to do that under lockdown, so am going to have to find a way to do it myself. Can anyone suggest an easy method that will shift the dirt without me having to scrub strenuously? I have a pressure washer, but that will produce too much overspray for the patience of my tetchy neighbour! A few years back I seem to remember discussion about snow foam.... does anyone have any experience of this? It sounds gentle and effective, but is it? Or any other suggestions?