Hello Petra! My name is Saul, and I live in city of Novi Sad in northern Serbia. I am demonologist and I have been studying occult, theology, and spiritual aspects for decades! Demons can be banished only by fast and prayer! Cleansing of home is not bad thing to do, but you must solve problem at its source, I suggest you cleanse yourself by, as I mentioned moment ago, fast and prayer. If you do have demonic activity in your home, do not try to solve it yourself, and be wary of people giving you advice to do silly things such as to burn incenses and perform magical rituals for cleansing, banishment, etc.
I would warmly recommend you to talk with Catholic priest, or even better Orthodox one!