CataClean works wonders, Helped me to get 3 old cars with skyhigh emissions through MOT and also a 56 Plate Renault laguna which failed miserably.

CATACLEAN 475ML CATALYTIC CONVERTER CLEANER FOR DIESEL & PETROL CARS AND VANS | eBay

Thanks for the tip but I'm not a huge fan of additives of this or any sort. I'd be astonished if any of this stuff survived the combustion process long enough to clean a red hot carbon encrusted cat. The company have a chequered history with the enthusiastic claims in their advertising. If it worked for you, great, but it's not for me.
 
Thanks for the tip but I'm not a huge fan of additives of this or any sort. I'd be astonished if any of this stuff survived the combustion process long enough to clean a red hot carbon encrusted cat. The company have a chequered history with the enthusiastic claims in their advertising. If it worked for you, great, but it's not for me.

ok,but why not give it a try,you might be very surprised.i know i was.;)
 

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