If you can identify the cause of the imprint, speak directly to him/her, in whatever room is the most affected. Chant:

"It is time to leave here, all is well.
There is nothing here for you, you must be gone.
Go now, go, complete your passing.
Go, and with our blessing and farewell.
Farewell!"

Be sure that nothing of the imprints energy field remains. Throw out any pieces of writing inparticular, and all photographs.