When cleaning an engine and you have the exhaust and carb pulled you need to seal the openings.
What I've always done is save old fork seals and cut a 1/4" or more section depending on the opening size, wrap plastic over the seal, pinch and insert the seal & plastic into the exhaust chamber or carb boot, then trim the excess plastic. The fork seal has a spring steel band and will seal the plastic to the opening.
REMEMBER TO ALWAYS STUFF A RAG INTO THE OPENING BEFORE PUTTING IN THE PLUG.
Now your opening is plugged for cleaning.

