Use of compression couplings would not need any cleanser, but yorkshires with use of solder and FLUX, does need cleanser, but not for more than 7 days, then fill & drain at least 3 times, until water runs clear from all rads. Drain from all rads., before recharging with reputable inhibitor, top up with water, bleed, run system, bleed again with it shut-down, then all should be well, although balancing the IRV's on the rads., may be needed, to push air out of the lines.
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