How to revert to default the SOURCE of some non-inheritable property?

Usually I rely on zfs inherit to unset properties I touch.
Now I guess that most of then were always inheritable and my action gave me what I expected.

But when the property is not inheritable that doesn't work.
So, please, how do I revert a non-inheritable property to its SOURCE default?

If I'm on a received snapshot, that might be solved with zfs inherit -S.
But if I'm not on a received file system how do I solve it?

Thanks in advance.