[smolder]

Huh? It cleans the brain? Care to elaborate or provide a source?

[ineedaj0b]

It certainly keeps you alert. Removes the ‘sleepy/tired’ feeling. But it might not clean the brain.

It might change the comfort level of ‘clean’ you brain finds acceptable before commanding the janitor out of his closet.

[smolder]

I suspect quite the opposite: modafanil is going to interrupt your sleep such that your body doesn't dispose of waste from the brain as well.