1. You go out and buy a Powerflushing machine (£400-£1000 depending on quality)
2. You hire a Powerflush machine (£80)
3. You dose the system with sludge remover additive, eg: Fernox, Sentinel for a few weeks, then drain down, remove every single rad, hose out outside, then refill with cleanser. Drain, and add inhibitor.
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