i think 4.6 is okay,but the man told me 4.5 or lower is better.you should look for those.
i wash my hair first with "ketonazol shampoo"once,which i have been using for 2 years now,so my hair would not seem sticky,then i gently rub my scalp and hair with the intimo gel,and leave it there for 30 min.then i wash it all,and leave my hair to dry on its own(it's not recommended to use a hairdryer).but you can wash your scalp just with the intimo if you like.
And,i should say that my scalp was in bad shape,with pistules with pus,or how is it called,but was not like in some of the pictures in this forum those are much worse.
i hope this would help you.best regards!