I usually use aircraft paint stripper, if a aerosol can of gasket remover isn't available. I have no idea what is available over there. A lot of them don't work as well as they used to, but then they are less likely to cause your boys to drop off. Not all paint strippers work well on gasket cement.
When doing it for a living, the aerosol worked the best, but I don't recall which brand. It saved a lot of time and saved a lot of alloy. Sold by Loctite, Permatex, and CRC, etc.