I agree with Lea Lea regarding the ingredients listed on the can. Hairspray has come a long way, even in just the past few years.
Lea Lea is also right that you can apply a lot of Tender Loving Care (TLC) and reverse any damage which might have occurred from using the hairspray.
Unfortunately I don't agree about baby shampoo. It can have some of the harshest chemicals on the shampoo block. It's an insider's joke in the hair care industry because it can seriously strip your hair of necessary oils.
I would strongly suggest you invest in an excellent hydrating shampoo and then dilute it...1/8th teaspoon of shampoo to 1 quart of lukewarm water shaken to form a suds. That will help your hair recover without stripping more natural oils.