Interesting, have several separate mold formations taking over on many parts of my inflatable boat's tubes, the issue with it is that the material is rugged dotted and the mold building into it. Have tried different products but have not been able to get rid of them 100%, are starting to grow where they previously appeared.
Will try hydrogen peroxide and if with no avail go per more aggresive cleaning materials such as acrylic paint thinner, bleach. BTW is bleach applied pure or must be disolved in water, if, so, in what proportion ? Will try a medium hard bristle toothbrush to make its way inside the rugged dotted material and wipe mold off permantely.
Happy Boating