I would say, a good shower is all that is needed. After all water is a very good energy cleansing fluid! As it charges very easily in energy, it can absorb all the excessive superficial energy... I've noticed my osteopathe washes his hands after every seance we have, even though he doesn't even touch me! (he does a kind of hands on healing that I can translate as something like "somato-emotional technique
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Also as the water also relaxes the muscles, it can also play a role in releasing toxins from the muscles... Therefore freeing toxic energy from the auric field! After all, physical, emotionnal and energetical bodies are intrinsecally linked! (in my belief system at least
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However I do agree with Mags... I think belief is very important! I think that as soon we consciously use a way to get rid of toxic energies, they start to melt away!