Removing paint from grout

[GrangeMouth]

Hi,

We recently had our bathroom re-done and we're after some advice on tidying up the painting my dad did (not that we're aren't v grateful for the work he's done but i'm pretty picky!).

The floor has been tiled and when doing the skirting board some white paint got on the grey grout. It's not coming off with elbow grease and sugar soap so is the next step white spirit? I would obviously do a discreet test patch but does anyone know if that will work and if it will damage the grout?

Thanks