I have been using this mildew killer for a while now it is great for mould in grout and silicon.
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You can buy it at bunnings.
For mouldy grout use neat apply and wait for 20 minutes than rinse.
For silicon apply neat and let sit for 6 hours than come back and re apply for another 6 hours your silicon should be brand new.
Read the label directions but I use it it at full strength for mouldy silicon and grout but if it is your wall that is mouldy than you can dilute 1-5 or 1-10 but waer a chemical mask.
Craig