Dish cloth (35 cm (13.8") x 30 cm (11.8)) Note: I used a disposable dish cloth as shown in the picture, but you can use cloth of any other kind, except for fluffy cloths. If you want to use a disposable cloth, wash it well to prevent color transfer to soap.
water
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Instruction video
Note: instructions on how to soften soap are shown from 12:09.