A good spirit & a blessing can be attached to an object to protect you from a dark force arrive with something that has attracted the wrong kinds of spirits or wrong energies. This is not superstition. Exorcists can tell you a lot about this.
These objects may be; candles, salt, silver objects etc. that are exorcised.
So many times in our lives, we have problems in our homes or at work or in our lives and we grow frustrated because we don't recognize where it is coming from. We never consider the true source. Most often, when there is such a roadblock, it is a spirit in or around a person or place, or around our own beings, but there are times when it is something that has come into our midst and needs to be purified.