My 2018 330i has developed a slight hesitation at low RPMs and fuel economy has dropped a bit. I've already changed the spark plugs and air filter, so I'm suspecting clogged injectors. I don't want to replace them because that's crazy expensive. I've been looking for an Injector Cleaning Workshop BMW Dubai that uses ultrasonic cleaning rather than just pouring some additive in the tank. Does anyone have real experience with this? Like, did it actually smooth out the idle and restore lost power, or is it mostly placebo? Also curious if they flow test the injectors before and after to show the improvement. I don't want to pay for a service that doesn't deliver measurable results. Would love to hear from someone who's done this on an N20 or B48 engine.