cleaning the honda

#1
So I got a Honda GX 140 off of craigslist and the guy said it didn't run (so I got it for cheep) so I sprayed some starting fluid in it and it ran but when I tried to get it to run on gas nothing happens. I will only run on starting fluid. what do you think I should do?

another question. this thing was on a paint mixer and it is just so dirty to look at what are some safe way to clean it with out wrecking it? a tooth brush and carb cleaner wont doo its that dirty
 
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