Is this a CRT with a glass envelope or an LCD? CRT screens can be cleaned with a soft cloth and mild detergent or glass cleaner. Some have an external coating so don't scrub hard. LCDs should only be cleaned when necessary and it's best to use a soft cloth and water first. I have found no problems using a weak solution of dish type soap either but, again, don't scrub....just be patient. You might check to see if the monitor's manual is still handy and has cleaning instruction. Of course, if you get the hair spray off, you will want to take steps to make sure this is not used in the area of your computer again. Good luck.
little dots of hairspray residue has built up on my screen how can i get it of without damaging anything?