Hazrat Abu Ja'far, Hazrat 'Amir, and Hazrat 'Ata say that blood will not be washed with saliva.

Hazrat Nafi' narrates that Hazrat Ibn Umar (may Allah be pleased with them) saw a blood stain on his clothes, so he washed it, but a black mark remained. He called for scissors and cut it off.

Hazrat Sha'bi says that when you wash off the blood, there is no harm if its stain remains.

It is also narrated in the same way from Hasan.

A woman asked Hazrat Aisha (may Allah be pleased with her) what should be done if menstrual blood gets on clothes? She replied: Wash it. The woman asked: I wash it, but its stain does not go away? Hazrat Aisha (may Allah be pleased with her) replied: Wash it, water is a means of purification.

Hasan, regarding the person who becomes unconscious while sitting, says that he should perform ablution.

Ibrahim says that when he regains consciousness, he should perform ablution.

Hazrat Ubaidullah bin Abdullah says that I went to Hazrat Aisha (may Allah be pleased with her) and requested, "Tell me about the illness of the Messenger of Allah (peace and blessings be upon him) at the time of his death." Hazrat Aisha (may Allah be pleased with her) said: When the Messenger of Allah (peace and blessings be upon him) fell ill, his condition became very heavy, then he fell unconscious. When he regained consciousness, he said, "Put water for me in a large vessel." So we put water in it and he performed ghusl (ritual bath). He got up with great difficulty, then he fell unconscious again. When he regained consciousness, he said, "Put water for me in a large vessel," and we did so. He again performed ghusl and got up with great difficulty, and again he fell unconscious. Then when he regained consciousness, he said, "Put water for me." So he again performed ghusl, and he did this several times.

Hazrat Musa bin Talha narrates that Hazrat Usman used to perform ghusl (ritual bath) every day.

Hazrat Ali (may Allah be pleased with him) says that I perform ablution even on freezing cold nights.