I have been studying about 'present perfect continuous' and found out that we use the tense to talk about a finished activity in the recent past. (source)
e.g., I’ve just been cleaning the car. (The car is wet and clean.)
And I also found out from the same source that we use the 'present perfect simple' to talk about a finished event or state in the very recent past. (source)
e.g., Niki and John have just come back from a week in Spain.
So can I conclude that for a finished activity or event in the recent past, I can use both 'present perfect continuous' and 'present perfect simple'?
If they are not completely interchangeable, please explain the differences. And I am sorry for my bad English.