The best way to ''clean'' your catalytic convertor is to take it for a good run at a constant high speed.
Most cars that suffer with convertor problems are used mainly on short runs so it does not get up to temp for a decent amount of time. One of my customers has a tidy oldish Focus that does about 2k miles a year. Every year for the test I have to take it out for an hour or so the clear it out so it passes its MOT on emissions, this involves a nice round trip with about 30 miles of motorway and dual carriageway.
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