Best was to removing / preventing mould on rafters?

Hi , Treat the areas where the mould growth has occured with a mould and mildew treatment using a brush , once this has dried spray all your rafters with an 8 in 1 dry rot and wet rot etc chemical 9 you can use a garden sprayer , work furthest point away and back to loft hatch , this will eliminate any spores not yet visible and also give long term protection , follow safety instructions on all solutions if doing yourself or expect to pay a contractor around 600 pound including materials . about a week later inspect the rafters for any surface moisture just in case there is excessive condensation occuring now roof is sealed. dampuk.net

Hi mark hope you found the products, question came up twice regards Joseph