Take some tea tree oil and mix two tsp of oil with a small cup of water and then add the mixture to a spray bottle. To get rid of the mould from the bathroom you have to spray the mixture on the surfaces on a dailly basis. Spray the mixture right on the mould stain and leave it sit for an hour or so and then using a scrubbing brush, brush the area well.
To reach the hard to get to areas try using an old toothbrush.
To remove the mould from the shower walls spray the mixture from the spray bottles on the walls and let it sit for 30 minutes. Use the sponge or scrub brush to clean the walls.