it looks like this :
http://tse4.mm.bing.net/th?id=OIP.Mc....1&H=160&W=160
you must put some alcohol on it, not too much, and then you clean gently the surface with it, from the inner of the disk,toward the outer of it. the goal is just to have alcohol spreaded over the disk, then use a second cotton with no alcohol this time, and then
wipe the alcohol from the surface of the disk, you'll see soon that the mould will come without ripping the disk surface.
(operation to do on both sides of course
Once fully cleaned and dried with the second cotton, close again the floppy disk, use some glue to keep both parts glued, and dump the disk. the result should be what we actually want.
PS : i have again my internet connection
PS2 : question to dastardly, what manual is he using to pass the manual protection of this preview ?