All that would do is wash all that grit and grime into the engine straight to the rings. Better to pull the carb and clean it proper.It looks pretty dirty inside. Have you tried spraying some Berryman's B12 carb cleaner in it WHILE it is running to clean out some of the carbon build up around the butterfly etc.
Tank needs to be spotless or you will have problems. As you can tell right now. You have a dirt issue.
Agree with the others, will need a carb rebuild or a new Chinese E-Pray carb. Pretty sure that carb is no longer made. Double check me on that.