My Heizungsinstallateur gave me good advice our existing radiator finally cleaned from the inside. Through the dust, the heating fins were clearly added. The heated air can at least that no longer circulate properly. This would result in increased heating costs. He could do the cleaning professional. With compressed air. But would be a "big mess" and not cheap. As an alternative, he advised me to Heizköperbürste. and what should I say. This radiator brush does definitely what they want. Namely make thoroughly clean! One would not even take off the grid on the radiators actually. At least in theory. One thing should be not underestimated times directly. A radiator to clean the slats I find correct slave labor. The time required is enormous and really should not be underestimated. Anyway, if you want to do it thoroughly and properly. For thus has a heater, depending on the heater size, many of these seeeeehr approx 1x1 cm small fins. So 100 to 300 I guess. And in our house we have 14 radiators. 8 I have up to now "managed". For the rest, I take a little more time. Should I be even finished then, I look at how long the slats stay clean. Because if the slats enforce quickly (to), I know in any case a. Pneumatic told you my plumber. Yes, compressed air does not sound that bad. :)