Utensils in hotels and selfcatering places are also used to serve haraam meat, pork and alcohol.

Answer

Muslims whose hearts have been contaminated and hardened by flagrant sin, fail to understand this simple issue. About them, the Qur'aan Majeed says: "Then their hearts became as hard as stone or even harder. Verily from some stones (rocks) flow rivers, and verily some stones split open and water gushes out, and verily some stones roll from heights out of fear for Allah." Due to flagrant sin, fisq and fujoor, the hearts become desensitized, hence harder than rocks.

This issue may be better understood with an analogy. Without this analogy desensitized hearts will not understand. They argue that once the utensils have been washed clean, then using them should be permissible. The issue is not of permissibility or impermissibility. The concern here is eating and drinking from utensils in which pork and liquor were served.

If a chamber pot which has been used for urinating in or even defecating, is washed thoroughly thrice or a 100 times with pure water, will it be taahir (clean / paak)? Obviously it will be clean. Will you now eat your porridge or drink your soup from this paak / taahir / clean chamber pot? Or will you consume porridge from even a brand new chamber pot which had not yet been used for its intended objective? If your heart can accept consuming food from a chamber pot which was thoroughly cleaned after having been used, then there is no problem for you eating from the aforementioned utensils. As for those who recoil at the idea of eating from such a chamber pot despite it having been rendered paak/taahir, for them it will be a 'kabeerah' sin to eat from the utensils of pork and liquor despite having been cleaned.