If you just had a bad argurment with a girlfirend, or boyfrined, or perhaps a family member, or if you have had a bad day at work or school, when you come home take off all your clothes and take a clensing bath or shower.
If you are taking a bath put purifying herbs, such as sage into the tub, or if you are taking a shower, burn sandlewood or rose incense, and when you get out of the shower pass the incense around you three times.
Wash all of your clothes, if some of it has to be dry cleaned, take it to the cleaners as soon as possible. Polish your shoes if leather, or simply wash them with a rag.
This will help clear away any bad vibrations that may cling to you.