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Hi Eggsy - i have tried both and I have found carb cleaner much better - the brake cleaner tends to evaporate too quickly and is not designed to soften carbon. Yeh keep lashing it down the port you can fell 2-3" inside the port and when you get it out clean it again and make sure it is not seized or sticking also check the valve seats are clean. Just remember its one of those jobs which requires gentle persuasion and loads of patience.
Currently in madnoel10's garage:
Honda Civic 1.4l