Don't wash your tractor with water. Water will corrode your switches and give you problems like no start or stall issues. Use a leaf blower or compressed air to clean your machine. Wash the tractor once or twice a year if you must, not weekly. Store the machine in a dry place. Don't spray the spindle bearings with water. They will rust and your going to replace spindle shafts and bearings often otherwise.
Keep fresh fuel in the carburetor, and when you store the machine off season, run the carburetor dry. Today's gas is not like years ago, it rusts the internals of carburetors. I cleaned or replaced several carburetors in the last several years on many of my out door machines. Ethanol fuel sucks.
Edit to add, I think we have the exact same machine.
Read all about mine here if you like.
http://www.lawnmowerforum.com/craft...-hear-any-good-bad-stories-your-tractors.html