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He's also never had a cab before. He must be getting soft as he ages.
For some reason I still think everyone on the internet is the same age as me, but based on your photos, your dad's about my age instead of you.
That being said, I got my first cab tractor two years ago. Can't believe I was too tight to shell out the small amount extra I could have a couple of decades ago to get the cab model. My son in law drives the non-cab stuff now.
Tell your dad to just get a small power washer instead of messing with the brush on a hose thing. Quicker, easier, and it's going to get dirty again anyway.
Also, if he wants to drive at night, those Rigid LED lights are about the same type of upgrade as having a cab. They have different ones, flood, spot, hyperspot etc. Tell him to mix flood and hyperspot and he'll be happy.