MAKKAH – For the safety of worshipers and visitors to the Grand Mosque in Makkah and to facilitate carrying out the rites, the Holy Ka’bah will be washed once a year on Muharram 15 due to the ongoing projects and expansion works. Royal approval has been issued in this regard, SPA reported Wednesday quoting Ahmed Al-Mansouri, spokesman of the presidency for the affairs of the two holy mosques as saying.