Shaykh Muhammad ‘Awwamah (may Allah protect him) mentioned the following incident:
I once visited Mufti Mahmudul Hasan Gangohi (rahimahullah) while he was in Madinah Munawwarah. It was after ‘Asr Salah. As the time for Maghrib drew near, an attendant (khadim) enquired from Mufti saheb if he wanted to make wudu and prepare for salah.
Mufti Mahmud saheb (rahimahullah) replied:
‘How can I sit in the company of this ‘Alim without wudu?!’
Shaykh ‘Awwamah comments:
‘I am not worthy of this, but look at the respect that Mufti saheb had for an ‘Alim.’
When visiting ‘Ulama, we should be presentable, and ensure that we are in the state of wudu. The Sahabah (radiyallahu ‘anhum) would also aspire to be in the state of purity (taharah) when meeting Nabi (sallallahu ‘alayhi wasallam). (Sahih Bukhari)
It is also recommended to apply a good scent when attending their gatherings.