What are the hazards of cleaning a three-way catalytic converter with oxalic acid?

[StephanieDella]

For many three-way catalytic converters that have been cleaned with oxalic acid, the side effects such as reduced purification of emission pollutants are mainly caused by improper cleaning. Especially, the mixing ratio of the oxalic acid solution should be prepared at a ratio of 1:10 with water; otherwise, it is easy to damage the three-way catalytic converter. More relevant information is as follows: Oxalic Acid: Also known as ethanedioic acid, it is widely used as an industrial bleaching agent or reducing agent. Due to its relatively weak corrosive acidic properties, it can greatly avoid damage to the three-way catalytic converter when cleaning substances like carbon deposits attached to it. Therefore, whether it's a 4S shop or a repair shop, they will use an oxalic acid solution to clean severely clogged three-way catalytic converters.