Removing ink from my alloys

[DezUk]

I was out cleaning my car today and i noticed on the front drivers side there is what looks like a patch of blue ink, its as if i have gone over a pen and it has burst over the wheel. I tried to get it off using hot water and meg car wash stuff but it wasnt for moving and i dont want to try using any alloy cleaning products as i have heard horror stories with them and bk 299 alloys.

Any ideas how i can get it off

 

[DezUk]

hmm im worried all these products will eat my alloys though

 

[DezUk]

hmm i've heard the toothpaste idea works so ill try that and see how i get on, failing that i have some meg nxt metal polish so i can try that