How to delete unwanted WiFi networks

I’m picking up 7 closed Wi-Fi networks in addition to my own. Periodically my wireless printer will somehow default to one of these other networks & I have to do a factory reset then input my network settings to get it working again. Is there a way to delete these other networks or at least prevent them from showing up? No settings I could find in Network, Airport Utility, Print & Scan or the printer’s configuration settings seem to allow me to do this.

If they are closed networks the printer could not connect to them.. it can only connect to open network if it doesn't have the passkey.
Unfortunately if people do not close their networks and password them, there is no way if their signal exceeds yours.. usually wireless will connect to the strongest signal of a known network or open one.
So live in a Faraday cage.. very effective.. See movie Enemy of the State.. the Faraday cage in the film was so effective the wireless microphones used by the actors would not work. ie they actually built the set properly to represent a paranoid person towards wireless survelliance..
http://en.wikipedia.org/wiki/Talk%3AFaraday_cage

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I had a problem where my iDevice (iPhone 4) would not automatically connect to my Wi-Fi router even though the name - linksys - was always present. I didn't want to 'Reset Network Settings' yet as there were some hotspots I didn't want to have to go through the hassle of entering 16 to 32 character passwords again. I was planning to try the 'Forget this Network' option, but it wasn't present. I tried the step above as a long shot and it worked. Hope this helps.

How to delete unwanted WiFi networks

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