820. Kashering Handles, Cups

16:12 The handles of utensils also require kashering but if they don't fit in the pot, they can be kashered by pouring boiling water on them. (If one knows for sure that the handles were submerged in a pot cooking on the fire, then they can only be kashered by immersing them in boiling water - Mishnah Brurah 451:71.)

116:13 All drinking cups and measuring cups are kashered by immersing them in boiling water. (Even though these things are generally used with cold, which should not require them to be kashered, sometimes they are used with hot - MB 451:154.) Glass vessels are not capable of being kashered according to our practice. Metal vessels that are glazed on the inside cannot be kashered by immersing them in boiling water but one may cause them to glow with hot coals as in the case of the mortar in 116:6.