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I removed fictitious beams that I had stuck to the ceiling. Apart from sanding, is there a trick to remove the glue knowing that the ceiling is Placo®?

On the plasterboard I do not recommend the application of solvent, or even scratching that may damage them. The steam cleaner is also not suitable because it may gorger water support, without action on the glue used (surely based Neoprene).
You can, however, try to heat the glue with a heat gun. This should allow you to soften the glue that you will remove with a painter's knife (spatula).
If that does not work, all you have to do is to line the ceiling with paint paper or canvas.

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