how do you get rid of mold in bathroom?

For surface mould on tiles, grout and painted walls: a diluted bleach spray or a specific mould spray, leave it ten minutes, scrub, rinse. Windows open and gloves on. Never mix bleach with other cleaners. But it'll come back unless you fix the damp. Run an extractor fan through the shower and for a good while after, crack the window, squeegee the walls. If there isn't a fan, that's the real job. Mould in the silicone needs the silicone replaced.