Removed the primary oxygen sensor and poured the cleaner to cat.
Run the engine to 2000 rpm and all the mess came out from the silencer.
The liqui Moly suggest to put this cleaner thru fuel intake so that it cleans the injectors, valves, combustion area and the cat system including o2 sensors
But the guy told me to not to try this on the smal engine so he just worked on the cat