All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah and that Muhammad is His slave and Messenger.
We cannot issue a Fatwa regarding the hairspray you mentioned, whether or not it must be removed before performing ablution, as we haven't seen it. However, it is easy for those who use it to know. The rule is that anything that prevents water from reaching the intended area which must washed during ablution must be removed. Meaning, anything that forms a layer that prevents the water from reaching the intended part of the body and is considered a barrier must be removed.
Allah Knows best.