Use leaf blower on tractor after mowing or wipe down by hand, hosing off tractor with water will create mechanical & electrical problems. Using water on electrical components battery, switches, relays, etc. pulleys, bearings, engines, deck components, etc. will create premature component failure. Using hands & eyes ensure all electrical connections are free from rust & corrosion & are tight & secure. A machine/welding shop will be able to make deck repair for a fair price.
Thanks, I have tried to get into the habit of using a leaf blower, but didn't know when I first got the mower. I'll avoid hosing it off!