WD-40 is a "multifunctional solution" with the help of which you can bring back to life the Home button of an iPhone terminal. Unfortunately, the iPhone 4 is the iPhone that had the biggest problems with the Home button and although there are some solutions on the Internet, the one involving technical alcohol si this with the WD-40 solution they seem to be the only ones that really solve the problem. An American applied the WD-40 solution to his own iPhone when the Home button had become sticky and it seems that he managed to restore its functionality after 3 applications.
In my experience, on not just my own iPhone 4 but also on my girlfriend's, WD-40 restores the responsiveness of the iPhone's home button to basically like-new condition. I just sprayed a little bit of WD-40 directly on the button, then pressed the button rapidly a few dozen times, tested its responsiveness afterwards, then repeated the process two or three times until it started to improve. Then I used the phone for a day or two to see how well the button did in actual use; I found that after a few days the problem ebbed back slightly, at which point I applied more WD-40. After the second or third application, the responsiveness remained indefinitely.
Unfortunately, using this kind of solution could invalidate the warranty, but if the device is older than a year, this does not really matter. In Romania you can find at Dedeman, and other similar stores, the WD-40 solution for about 10 RON, so it is a more than cheap solution that could help you.
