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, since they may get moldy. If you want to use a disposable cloth, wash it well to prevent color transfer to soap.
Microwave
water
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Instruction video
Note: instructions on how to soften soap are shown from 2:45.