My old tractors never get a wash however the new Kioti will get a wash every couple of months. For me it gives me a chance to go right over it an check it...while its in warranty. I also spray de-greaser on the loader arm joints where the grease builds up etc. afterwards I go through and re-grease and spray WD40 on some of the controls. It was expensive and I plan on keeping it for a very long time so want to look after it.