How can you wash permanent hair extension?

Do you mean pastel hair dye? It depends on if you use a permanent dye or a semi-permanent. Semi-permanent hair dyes will wash out and fade over time; permanent hair dyes will stay in the hair until you cut it or dye it another color.

A clip in hair extension is a non permanent way for a person to either lengthen or add body to your hair.

If they're real, you wash them the same way you would your regular hair.

Can the permanent color hair spray easily wash away during washing

yes, fade and eventually wash out

i had my hair dyed semi permanent on the first of 1st of September and my hair has kept the colour well till now. After a while why did you want to wash it out ?

Yes. Over time it will permanently lighten your hair.

It's impossible to completely remove it, but if you use clarifying shampoo and wash your hair everyday, it will wash out faster.

Yes but it will only take effect on the roots, and it will wash out.

You can't because it is permanent. You'll have to dye it again or wait until your hair all grows back.

Yes. Semi-permanent colors are usually applied to shampooed towel dried hair.

Because it is permanent? So it can't come off. :S

It depends if you got temporary or permanent hair dye.

No on the box it says Semi- Permanent and that is fades away as you wash it!

Permanent dyes do not wash out every time you wash your hair. Most store bought ones say that they are permanent but they are not. If you go to the salon you will see the difference.