Pour some fine-grain salt (cleansing) and honey (nourishing), perhaps a bit of cream (restoration) into a cup. Make a slurry -- enough to bathe with. Do not dissolve the salt; you need to feel it later. Bless it if you wish, as your own practice may choose.
Take a shower or bath. Use the slurry to scrub away the itching curse, all over. Rinse thoroughly. Feel the curse being washed away by the rinsing water, and believe it goes down the drain with the same.