Great Wall c30 Clean Throttle Guide

However, this method needs to disassemble the three-way catalytic device, which has certain requirements on the mixing ratio and soaking time of oxalic acid solution, and improper use will destroy the internal structure;

Disassembly-free cleaning

That is, by "hanging the bottle" or adding cleaning agent to the fuel tank, but this method is not as effective as the first one, and is suitable for use in the case of slight blockage of three-way catalysis.