Now every honda workshop and dealer ship cleans cat rather than removing it.
Honda pitshop gujrat guy also told me to clean it.But since i already removed it from my two cars corolla 1.6 and swift and satisfied with their performance so i removed it.
But now i regret my decision since my civic is only 20000km driven i should have cleaned it.
That idiot destroyed my brand new O2 sensor.Now i have to install used Kabuli one
Advice:Never ever let roadside machanic to do experiment on your car.