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I have spent hours flushing my heater rad in my Mk 4 Cortina using different products including the Harpic with phosphoric acid and never achieved any significant increase in flow or heat transfer. The last straw was rusty water in the passenger footwell so I bought a new rad from demister man, took ten minutes to fit requiring only marginal relieving of the holes in the front plate. It came with a strip of self adhesive foam and I used some halved pipe lagging to ensure a snug fit which I taped on with duct tape. When I was bleeding the topped up coolant sysem I cracked the jubilee on the top heater pipe which is the highest part of the system; I was astonished to see a jet of water emerge rather than a rusty trickle and the demist vents issued hot rather than mildly warm air . My advice is don't bother messing around with an aging heater rad buy a new one, it will keep the interior of the car dry and warm and keep the windscreen clear of fogging and condensation. It is easy to fit needing only a crosshead and a flat screwdriver on mine. If you do remove your heater rad for any reason make sure you unhook the battery first as it comes close to the ignition starter solenoid when drawn from the heater box. Nice warm toasty feet too.