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		I've used them before.  Why so sticky?  They are just like a normal power point.  The only thing keeping the plug in the socket is the spring pressure of the copper contacts.  Just take the cover off the socket and open the contacts up a bit.  Problem solved.
	 
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		Just a thought....
 
What do the blades on the plug look like once you get them out?
Any evidence of arcing (such as pitting, discolouration etc).
 
I'm thinking the contacts inside the sockets could be getting dirty(dusty, corroded) and causing a bad connection and (arc) "welding" the blades to the contact. Could be worse if your trying to suck a larger amount of power through them like for a fridge.
 
maybe try cleaning the contacts and blades
 
Stevo
	 
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		Hi Pedro, the best stuff I have ever come across for lubricating electrical equipment, particularly the sort of contacts you are having problems with, is anything with a lanolin base.
Great for protecting battery terminals.
You can spray it on anything electrical ( 12v ) and just let it dry and your ready to go, mind you it can take up to a day or two for it to dry.
It’s also great for stopping rust from forming or if it has already, it will stop it spreading further.
And you can apply it to wet surfaces.
Great for lubricating and protecting tools, thats hand tool, are I mean tools in a box, um that is in your garage, O you know what I mean.
And if you can’t find it in a spray form, just nic one of your neighbours sheep and rub it on what ever you want to protect.
Seriously, the best form of lanolin spray is put out by Briggs & Stratton and you can get it from most lawn mower outlets.