I find this is a big problem when working with other "KIDS" model.lol
I do find that swan lighter fuel works well and dot 5 brake oil works at removing paint and glue.
But it does depend on what super glue it is.
If these do not work i would say try using very hot steem or ice cold water but you said these did not work.
You could buy some super glue deactivater "sorry about spelling" but it is hard to get hold of.
Hope this helps