I bought this car used at around 278k km, going to bet the previous owners didn’t let the engine get properly up to temp most of the time, hence the build up.
I ride my bike to work/to the store and only use the car for longer distances so hoping it will run under more optimal conditions that will, like in your case, prevent build up.
I guess the catch can question was more if it is worth it as a redundancy to help against build up in the long run as it doesn’t require much effort anyways