From my lounge!?!

Its only a few months old, but I guess thats a bonus that comes with living the high life on the coast! Humidity & never ending mould!

I've just discovered it on the back & in between where the two parts of the lounge join together.
Any idea's on what would remove it from the brown suede type fabric without turning it yellow, or orange??

In between maybe it won't matter about colour changing, as it won't be seen, but on the back it will be.

Actually... Its scotch guarded... anyone know if its covered by them to be removed???