I've tried everything from alcohol to hydrogen peroxide to clean my MagSafe adaptor then handed it over to my dad the electrician and now it works like new! The small pins on the adaptor have springs under them and over time accumulate dirt. I believe the middle small pin is the culprit. Things needed: Paper towel, WD-40 and a flat screwdriver or a kitchen utensil small enough to push down the pins down slowly and safely. 1. Unplug the adaptor from the wall/socket(power source). *SAFETY* 2. Spray WD40 on the small pins. 3. Wipe excess WD40 with the paper towel. 4. Push down the pins lightly with a screwdriver or kitchen utensil, enough to get the pins moving. 5. Wipe anymore excess WD-40. 6. Blow cool air on it if needed. 7. Test adaptor. Another thing to point out is that when removing the adaptor from its socket on the macbook, don't tug the wire, grab it from the hard part and remove it. Hopefully you guys can sticky this. Should help people that have trouble with the MagSafe adaptors.