headscarf

Assalamualaikumi am a student.. and have to offer afternoon prayers in a limited time.. i wear the hijab but it becomes tedious for me to unwrap it before ablutions and the wrap it again afterwards....so i end up offering prayers in a hurry.... i wud like to ask u if it is permissible for me to perform ablutions with my head scarf on???? ..if i just slide  my wet hands over the hijab, will it do??

Assalam Alaikum, I have 2 question  regarding wadu 1st. doing massa of hair during wadu by women are they allowed to wipe there hair above the hijab or they need to wet their hair 2nd. Can we do wadu and wear socks and later to perform wadu just wipe wet hands over the socks. These questions are particularly in reference to hajj time when a women is in ihram and cannot show her hair. I would greatly appreciate your answer jazakallah