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konastab01
A powerflush might still be a good thing. The difference is that the usual force of the water in the normal CH circuit isn't enough to move the sediment/crap that piles up in the middle of the radiator.
Random google link: https://hynesplumbingandheating.com/central-heating-power-flush/
A more thorough (but more expensive) approach is removing each of the radiators and flushing them individually whilst also turning them round/over so that the sediment is disturbed.