it looks like impossible to remove them.
i made a private node and edited the permission of each user manually to let them view and write in that private node..
but now. even if i set all the permission to No.. they still in the list..
You need to reset each user you want to remove to inherit. In the way you've done it here, it'll be a manual process.
The better way to handle this is to create a group for the private node to have access and just add members to the group.
It's much easier to update/add/remove users from a group than do this one by one.