Catalytic converter cleaner removes the carbon build up in your engine and exhaust system. So, the answer is, yes, catalytic converter cleaner works every time you use it to break down carbon deposits. Using it regularly will help clear out those stubborn deposits and prevent new carbon build up from forming.Click to see full answer. Keeping this in consideration, can a clogged catalytic converter be cleaned?Clogged catalytic converters typically aren’t cleaned, they’re replaced. Once a cat gets clogged the exhaust is able to superheat the catalysts inside, melting/fusing them together and creating a more significant blockage. There is no saving it; it must be replaced.Also, can you clean a catalytic converter instead of replacing? Cleaning your catalytic converter without removing it The product that you can use is the OXICAT – Oxygen Sensor & Catalytic Converter Cleaner . You tap it into your fuel tank, and it does not matter if you have a petrol, diesel or hybrid car. Drive your car a couple of miles to see if your car runs better than before. Subsequently, question is, which is the best catalytic converter cleaner? Here are 10 of the best catalytic converter cleaners for your car or truck: 1) Cataclean Catalytic Converter Cleaning Treatment. 2) Hi-Gear HG3270s EZ. 3) Solder-It CAT-1 Catalytic Converter Cleaner. 4) OXICAT Oxygen Sensor & Catalytic Converter Cleaner. 5) CRC 05063. 6) Sledgehammer Catalytic Converter Fuel System. How long does it take Cataclean to work?Catalytic converter cleaning doesn’t take long to carry out. You should allow around 15 minutes for our technicians to do the work. You’ll start to feel the results after around half an hour of driving.