How do I get my volleyball shoes to grip the court again?

Ive noticed that my shoes dont grip the court as much anymore. Ill admit ive used them on concrete before but only for a short trip(s). My teammates told me to try spraying hair spray on the bottom but that didnt work either... help!!!How do I get my volleyball shoes to grip the court again?
I've been playing volleyball for 6 years, I'm currently playing in college. From my experience volleyball shoes have a life expectancy of about one season... so maybe it's time to just get a new pair. Also towards the end of my shoes life before each play I just wipe the bottom of the shoe with my hand to get the dust off. It's annoying but it works.How do I get my volleyball shoes to grip the court again?
BUY NEW SHOES! You do not want to risk an injury by having slippery shoes. You should buy a new pair of volleyball shoes every year. If hairspray is not working, then I dont think you can save your shoes. Try looking for brands like Mizuno*** and Asics are oaky too.
sometimes, the grip on volleyball shoes wear off after around a season of play. So, maybe you might need to buy a new pair. Perhaps they are just dusty, if so, you can wipe them on your shoes, socks, hands, or just on the court. whatever works for you!
Spill a bit of water away from the court but on the gym floor. Then step into the water and walk around hitting them so that they squeak (best way I can explain it? lol). Do that until you don't feel like they are sliding anymore and you will have grip because they aren't dusty. =)

Works everytime
Use a cloth to clean the sole before you put them on. Gym floors are rarely very clean so I would recommend keeping a wet towel close by to wipe your shoes off when they start to not stick anymore.