Addinol Catalyst System Cleaner
Profi-car Catalytic Converter Cleaner
Oxicat
You can use any one of them whichever is available and cheap. All of them work very well. Here are some tips to make these fuel additives most effective.
1) Use the additive before filling the petrol, so it could be mixed well in the tank when filling the fuel.
2) For vehicles with big fuel tanks, use it in half tank. For example Honda City have 40 liters of tank. Use it at half tank, then fill Rs. 1000 of petrol just to get it mixed in the tank. In case of Alto, you can fill the tank to full since it has only 27 liters capacity. Even though some fuel additive manufacturers claim their products can work in fuel up to 42 or 48 liters but using it near the fuel quantity limit may not give you good results.
3) The ideal time to use fuel injector or catalytic converter cleaners is before long trip specially motorways. But if you can't do that, try to drive the vehicle between 2000~3000 rpm. If you drive at low rpms in city driving, you will not get the expected results. So in city driving, you can use S mode in automatic to keep the revs high. Also, it won't be effective if you only do short trips where engine do not reach operating temperatures.
4) Use the additive only if you know you can consume the tank in a week or so. The reason for this is to avoid prolong stay of the cleaner in the fuel system.
