Dont even try that. Seriously dude, u might not be the lucky one to save ur defy. Moto is a fake. They have been thrown away from india but they came up with android only handsets, failed again. They suck in service and quality. Regret having a moto device .
Sent from my Moto Defy
Before putting your Defy in water you need to understand what IP67 means and what is the phoen designed to resist.
I took my Defy to a water park and it was amazing. I have some really cool videos and pics underwater, got a video in a Waterslide and so on.
Few things to understand about IP67:
-Phone resists 30 mins under water, at 1m depth, and NOT MOVING.
Once your phone goes into water you have to avoid rapid moves with it, when you move the phone under water, you can create pressure equivalent to having the phone 50m underwater (standing still).
Another really important thing is the rubber on the USB/Headphone/Battery Cover. You cant touch this rubber, nor apply any kind of oil based grease (Sweat, Vaseline) on it, cause it kills the water resistance attribute of it and actually dryes the rubber.
Its recommended to apply a bit of Silicone based Grease every few months to keep the rubber in good condition, after about 3 years it will eventually lose its properties and start leaking water.
If you are taking your phone to a water-adventure day like I did, I recommend using a bit of duct tape on the USB port and Headphone to avoid it getting accidentaly open.