How often does Toyota's overbearing throttle clean?

First of all, according to the different road conditions of the vehicle, the amount of carbon deposition at the throttle will be different. Generally, when driving in urban congested road conditions, carbon deposition will be more serious. For Toyota Corolla, 4S shops generally recommend cleaning carbon deposits every 20-30 thousand kilometers. However, if the vehicle has a fault related to carbon deposition in the throttle during use, it needs to be cleaned according to the actual use.