Clean your space. Like the entire house.
Mop the floor. Put salt in mop water.
Fill saucer with water. Place underneath bed.
Pray.
Such was my mother's recipe. Not exactly a priest, but dealing with the unclean is a hazard of the family business. My grandmother dealt in talismans, and instead blessed things to hang over entryways.
I personally don't have the training to make one stick. Instead just pray authoritatively when an intrusion happens.
(Not for nothing, but read and understand The Book of Tobit for more information on why there are so many variations.)
Also, you'll know when it takes. Don't be disheartened if yours requires a prolonged fight.