Can a person wash your hair with sunlight dish-washing liquid?

Sure they CAN do it (they can do a lot of other things that are bad or good as well)... but it's a very BAD idea to do it. It strips the hair and scalp of the natual oils they need.

As Smoothy said : yes you can but not good for the hair,or scalp.

You can also condition your hair with: fabric softener- again not good for the hair.

However I know someone who does this the whole time,and she has lovely hair!!

There are Mothers who use fabric conditioner on their children's hair when they have nits,when I questioned them about it,they said, " it stops the nits from getting hold of the hair,they just slip off", - the Mothers recommended.. Comfort softener saying, " this worked the best"... you learn something every day.

Why do you want to ? Was there a problem you were trying to solve? Did someone or some web site tell you to do this?

It is not a good idea.