101. Sierra Carbon Free Aerosol is the best carburetor cleaner we’ve used. It’s designed for marine applications to remove gum and varnish from intake systems by spraying it into the carburetor or combustion chamber. But it does an incredible job to clean carburetor components, too. Don’t use it like conventional carburetor cleaner where you hose down everything to flush away the crud. Instead, spray it sparingly on the parts and allow them to soak.