once every other day
There is no "good" or "bad" time to wash your hair.
It is very easy to wash your hair. You need to wet your hair, put shampoo on your hair, lather and rinse.
Yes, you should wash your hair if you are sweaty. Washing your hair is on an "as needed" basis. If your hair is greasy or sweaty you need to wash it.
No, i guess u don't need to coz in the procedure of hair spa they will wash hairs after hair massage.
I like Wella mouse it only lasts 6 - 8 washes
Yes. It is recommended to wash your hair every second day as this prevents greasy hair. If you need to wash your have after one day then do, but not regularly.
Shampoo and water.
No.
To keep it clean
If your are talking about your first wash, you need to wash your hair twice. The first wash the water doesn't get all the way in your hair and makes it harder to rinse out. The oils on your hair block the water, that's why you need wash it twice. The shampoo breaks down the water, letting it get deeper into your hair,
If you do not wash it for a long time.
When you first get a perm, wait 48 before you wash your hair. After that, you can wash it every day or as needed. I wash mine every day because my hair is very fine. It all depends on your hair type.