Ich treatment (fish) on wallpaper?

Question:My bottle of ich treatment that I have used in the fish tank tipped over in my cupboard and leaked out. It leaked down my wall on my wall paper. Now I have dark blue streaks running down my wall. Was wondering if anyone knew what would get it off without ruining my wall paper? I tried Mr. Clean but it only lightened it up, didn't take it all off

Answers:
try using a fresh squeezed lemon or orange and use the juice on a washcloth or a light scrubber it may work the first time but it may take 2-3 in all hope that does the trick for you!