Hi guys, The home button on my iPhone 4 is getting worse and worse. I now need to press it 4 or 5 times (each time) to get it to work. It's driving me nuts! I've heard that a couple drops of 99.9% isopropyl alcohol might do the trick, but here's my question: Does it HAVE TO BE 99.9% isopropyl alcohol? Or can it be 91% isopropyl alcohol? I can find the 91% stuff in local stores for fairly cheap, but I'd have to order the 99.9% stuff online -- and frankly I'd rather not spend around $10 for literally 2 drops of this stuff. Anyone know? Thanks!