Part I Nat Bar Nat Issues In Washing Utensils

  1. Defining Ben Yomo w/ regards to this matter
    • Used over fire w/in 24 for food of type – called ben yomo
    • Used for pareve – not called ben yomo
    • Used as kli sheni – not called ben yomo
    • Doubt as to whether used at all – not ben yomo
    • Used but not known if as kli rishon – called ben yomo
  2. The Basic Rule and Case of Nat bar Nat when washing – Clean ben yomo dairy pan washed again in clean ben yomo meat cauldron
    • Sefardim – they treat as nat bar nat… pan and pot each exude secondary taste into water
    • Ashkenazim – they are worried for 1) touching of meat and milk pot when hot and tastes go straight to eachother, 2) the tastes mix in the water before having a chance to become secondary
  3. Eino B/Y utensils washed together or one of two was aino B/Y (either cauldron or pan) – both pan and cauldron fine but water assur
  4. Utensils that weren’t inspected for cleanliness – are assumed to be shmutzik and cause problems
    • Neither cauldron nor pan were inspected – pan and cauldron -kashered – absorb opposite taste
    • One was clean – same as above
    • Sixty in the water – if one was clean and there is sixty in the water against the meat residue okay
    • One was an eino ben yomo – pan clean cauldron dirty – cauldron okay pan needs koshering, pan dirty and B/Y and cauldron clean and not B/Y – if not sixty in water both need koshering
  5. Washing successively – if first on was clean second is okay, etc. if first soiled next one needs kash
  6. Washing in a kli sheni (even together) – Rema – even dirty pots not a problem kli sheni can’t do a double transfer, Meharshal – if soiled assur since dissolving is natural then one transfer is doable in kli sheni
  7. Washing in irui kli rishon – if hot water poured over both meat and milk residue on vessels and connects both: Rema – mutar bdieved, Shach- if soiled both must be koshered, one clean one soiled – clean koshered soiled koshered unless financial loss
  8. Washing with detergents – anytime detergent is used in the above cases nothing becomes treif since it makes all residues and tastes ta’am lifgam
  9. Finding cutlery and such amongst the “other type’ – sfeik sfeika – 1) it may have been washed separately and placed in wrong place, 2) even if together maybe the other dishes were clean, not yad soledes water, or sixty in the water, or at least maybe detergent was used. I found in dishwasher though – then there is no real sfeik sfeika

Part II – Using The Same Sink For Washing Meat And Dairy Dishes

  • Minchas Yitzchak – Assur –you must have two sinks or take real precautions. Either hold the dishes in hand the whole time or use both racks and basins. Make sure the sink is clean in between uses.
  • Igros Moshe – Mutar in essence. Ideally you should have a rack and avoid the water level while yad soledes from rising up to reach the dishes

If you find a utensil of the opposite type in the sink see above. The Minchas Yitzcahk says that some are stringent to kasher the utensil.