Mister Pronka(1991)

Original title: Mister Пронька

A rich American comes to Russia with a task from the government to convert some Russians to the "American faith". The American finds a ragged man named Pronka in the marketplace and makes a bet with him: he gives Pronka money and the opportunity to trade, and if he does not wash for 15 years, Pronka can take all the income for himself.