This is a visualization to wash away negativity, when you feel you are just having a run of bad luck.
Draw yourself a hot bath. Burn a purification incense such as lavender, chamomile, or sandalwood. Light a white candle and turn off the lights. Get into the bath, and just lay there, relaxing your body for a while. When you feel fully relaxed, visualize the negative energy as a black, sticky film covering your body. Visualize the hot water slowly evaporating the film into the air. As it leaves your body, it moves towards the candle flame, where it is burned away. When all the film has left your body, drain the tub while staying in it. After doing this, take a short shower. Imagine that the water pouring down on you is pure white light, showering you with positive energy.