I've got a Briggs and Stratton 6.5HP OHV self propelled mower, how do I clean the carb?

Someone put kerosene instead of gas inside it and ran it until it died about a year ago. It's been sitting and hasn't been touched. I Just recently drained out the kerosene and put in fresh gas then cleaned the plug. I got it to start finally, but it's running extremely rough, even after 15 minutes of running, and I have to keep priming it to keep it running. So I'm guessing that the carb needs to be cleaned. Could anyone tell me where it's at on the mower?