Keyless entry button on door handle not working

[snapdragon]

Just got my passenger lock button working again using this I 'borrowed' from work...
http://www.ebay.co.uk/itm/like/271801783112

I can't believe my post above was in January and I put up with it for over 9 months. I used the straw and blasted it at point-blank range repeated all around the gap between the grey silicone rectangle and chrome. It started working after a few seconds. I jabbed the button a few times during the procedure but it started to freeze my fingers. It leaves no residue and I also did the undersides of the handle for the unlock function.

Now all four lock every time. Unlock only seems available on the front handles, so maybe I was wrong thinking I had intermittent problem with needing to lift the handle twice. Maybe it was just when I tried the rear handles. Can anyone one confirm if the rear handles do a proximity unlock or only handle-lift unlock?

I did finish with ECP http://www.eurocarparts.com/ecp/p/Ac...897322&cc5_152
Silicone spray with eurocarparts in the hope of keeping water out of the buttons.

Thanks.