I agree with the recommendations for HG. I think what is important though is to leave it on for the whole day-the longer you leave it the more effective it will be.
Also make sure your room is well ventilated before, during and after. Fir a whole wall I would wear a mask as I'm allergic to the mould spores.
In addition mould doesn't grow in well ventilated areas- so keep all internal doors open, even a little bit and open windows at least once a day. This helps the moisture escape and not settle in one place. Also, don't put anything against the wall- always make sure there is room for air to circulate so leave a gap, again, even a small one will help.