There are a few different places where you can spray carburetor cleaner. The most common place is directly into the carburetor throat. This will allow the carburetor cleaner to reach all of the nooks and crannies inside the carburetor and help loosen any build-up that may be present. Another place you can spray carburetor cleaner is on the outside of the carburetor, specifically on the throttle plate and linkage. This will help clean any dirt or grime that has built up on these parts over time. Finally, you can also spray carburetor cleaner into the air filter housing. This will help remove any dirt or debris that may be blocking airflow to the carburetor.