Kashrut: Non-Certified Soap

Soap must be considered non-kosher unless it is certified kosherSoap without kosher supervision should not l'chatchila be used on food utensils--even if you use cold water and even on glass--because a soap residue adheres to the surfaces, even after careful rinsing. 
Bar soap is generally made from animal fat. Since all soaps do have taste and might be edible by a dog, they might not be nifsal for a dog and therefore cannot be used on eating utensils.
Note However, a dish remains kosher b'di'avad if washed with cold water and non-kosher soap made from non-kosher fat.
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