Black mould!

purdyhorse

I clean the white sealant that sits between the external body panels on my two years old Autosleeper by wiping them with white spirit (as recommended by Autosleeper's service dept). This works very well except for on the roof joints where small spots of
black mould have developed. So far I have tried using Dettol mould remover and commercial soap solutions (G101) in order to remove the spots but to no avail. Has anyone found a successful way of dealing with this problem?