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Yeah, sugar soap & rinse, then mist coat and fill so it's smooth. Tidy up any gaps where it meets woodwork etc with either filler or caulk and you're good to go, or at least that's what I've been doing. If the plaster is hollow when you knock it, consider ripping it off and patching it up, but beware it's dusty and you'll want to be confident you'll be able to get a smooth flat finish
rhowe
Thanks. Will try that. Don't need to fill much apart from doorframe and window so then will crack on with painting.