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Are there any halachot that apply the rules of kashrut to the cup I use to wash my hands before I eat?

This answer says that one can use "any cup". This site says that a cup can be drunk from and the water can still be used so I thought that this meant that the cup for washing doesn't have to be a dedicated washing cup and can be used for foodstuffs otherwise.

If I am about to eat a cheese sandwich, may I wash with a handled cup that was recently holding beef gravy but has been rinsed out? What if the cup held a non-kosher beef gravy? What if the cup held nothing, but was washed in hot water with dishes that were used for milchigs/fleishigs/treif food -- is there a "status" to the cup that could contraindicate its use at particular times?

  • Are you washing with water that is yad soledet bo? – Double AA Jul 31 '17 at 11:48
  • @DoubleAA what's the difference? Chay eno bolea. – msh210 Aug 1 '17 at 17:51
  • @msh210 If the water is cold then it hasn't absorbed any flavor. Perhaps the OP was concerned that having Treif water on your hands wouldn't effect Taharah (a la judaism.stackexchange.com/a/83621/759) or would possibly fall onto the food. – Double AA Aug 2 '17 at 12:54

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