It is makrooh to use the utensils of the unbelievers, including the people of the Scripture, or their clothes.

Abu Tha'laba Al-Khushani narrated: "I said to the Prophet (P. B. U. H): 'We live in a land ruled by the people of the Scripture, can we eat using their utensils?'

The Prophet (P. B. U. H) said:

"As for what you mentioned concerning the people of the Scripture, if you can get utensils other than theirs, do not eat out of theirs, but if you cannot then wash their utensils and eat out of them".

[Al-Bukhari, Vol. 5, The Book of Slaughtering and Hunting, Chapter 4/5161].

Furthermore, the people of the Scripture do not avoid najasa.

Yet, it is not prohibited to use their utensils because the Prophet (P. B. U. H) allowed them into the mosque, used their utensils, and ate their food.

It should be noted that the meaning of Allah's (G. B. H) saying:

{Truly the pagans are filth (najasa),} [Al-Touba: 28] has to do with the impurity of their beliefs and religion, not their bodies and utensils.