Manually removing stored Wifi networks from iPad?

I have a rather interesting question:

As we all know, iPad will remember wireless networks we connect to by way of the settings app. Whenever those networks are in range, iPad will automatically connect to them. (This also applies to iPhone/iPod touch)

Suppose that you at some point logged into a network, using the settings panel, but you later wish to remove it from the list of saved networks (e.g. you're giving the iPad to a friend to use, giving it away, etc.)

So far, the only way I know of to do this is to be in range of the network in question, then select it in the settings panel and choose Forget This Network.

This to me represents a potential security risk. Suppose that you pair your iPad to a corporate work network. Later, you decide to loan out your iPad. All the person you loaned it to has to do is go in range of the office network (Which is heavily guarded by WPA2, we'll assume) and poof, they're in, because your iPad saved the network. Someone who is not authorized just penetrated a LAN.

Normally, you could simply remove that network from the remembered networks store prior to loaning. Mac, Windows and everything else seems to have a way to remove remembered networks manually. However, on the iPad (and any other iOS device) I can't find a way to get the device to forget a known network, unless I happen to be in range of that network at the time. Is there a way to do this?

FM