Question: I have now built up a small portfolio of pencil/charcoal drawings. Most of the time they are kept in my folders, but sometimes they are viewed by friends and relatives. And on the odd occasion displayed at the local community hall.

I've started to notice finger marks and tiny smudges on the artwork. As none of pieces are permanently displayed I don't want to frame them.

What is the best way of preserving and protecting my pencil/charcoal art without having to put them behind glass?

One of my friends said that you could use hairspray? Is that the right way to go?

Answer: 
Hairspray definitely works, but I'm not sure whether or not it will yellow over time. You can also buy fixative spray that is artist's quality and presumably tested for its pH and other qualities.
Hairspray will work but will yellow over time. Get the Krylon fixative mentioned above. Any hobby store will carry it. You can also use clear varnish from the paint department at a big box store.