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Boiler cleaning

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STEAM DOCTOR
STEAM DOCTOR Member Posts: 2,509
This is a general question(related to my post about high CO). What is the most effective way to clean cast iron boiler combustion gas passageways? Brushing? Hosing? Vacuum? Combination? The standard (I think) is brushing and vacuuming. Seems to me that pressure washing would be more effective(obvious drawback is need to allow passageways to dry).
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