Frequently Asked Questions and Answers found in Halacha

Rabbi Akiva Moshe Silver

Which soaps are allowed to be used on Shabbat?

In the case of soap that is a little thick, there is a fear of smearing it, that is, of erasing (i.e. from Mishnab ss. 26), and even a little thick 20 in a second thread (Ha Pid Skab) which cannot be allowed since the calculated rate was not explained is not thick.

And regarding a piece of soap, some of the arbitrators have a concern about it being born by a substance that melts (Rama there, and in the MB there there are some who disagree).

And regarding soap made into foam, the judges discussed and divided on the side of spreading (see in the comments and additions there), and it should also be discussed on the side of birth when a new form of foam is created that was not here before, like what the judges discussed on the melting of snow and freezing of water.

Therefore, the clear permission to use soap on Shabbat is with soap that is completely liquid and does not contain foam and does not use a scotch cloth when cleaning with it, and you can also use regular soap and dilute it a lot and remove as much foam as possible from it on Shabbat evening and prepare it for use on Shabbat.

(I wrote about the smell in the dishes in a separate answer).

And for those who do not want to fear all the methods, there are ways that even with other soaps, he is kosher according to some of the methods, and he will read in the books of the judges or ask a wise question.

מק"ט התשובה הוא: 3746

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