Carb overflowed, oil/gas out the exhaust pipe. Plugs are slimy. How do I clean out the cylinders without tearing apart the whole engine??

https://i.redd.it/wb9y1ets4tg41.jpg via /r/CafeRacers https://www.reddit.com/r/CafeRacers/comments/f3m07m/carb_overflowed_oilgas_out_the_exhaust_pipe_plugs/?utm_source=ifttt