What is the difference of meaning between these two sentences

Я должен убрать мою комнату

и

Я должен убирать мою комнату

First sentence is using the prefective and the second the imperfective

In first sentence I would say the meaning puts the stress on the action in itself

The second puts the stress on the lenght of the action?

Perfective and Imperfective is still confusing in many cases, especially the infinitive.


Thank you

Mordan