Removing Cornice Cement

I am in the process of renovating the bathroom and I want to get rid of the old 75mm cornice and finish the walls square with the ceiling.

My ceiling is Stramit Board and I need a way to remove the last traces of the cornice cement without damaging the surface of the ceiling which is essentilly the same surface as gyprock - some sort of thick paper based material so not all that durable.

Given the cornice cement is a calcium based product I thought something like vinegar might do the trick but I am looking for suggestions please

Ian


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