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1. There have been threads on the topic. As far as I know, there is no way to clear the search results from maps. You may be able to do so if you can identify where they are stored and delete the file with a file manager such as Astro.
2. Go to your google account on your computer (or using the browser on your phone.) Your credit card is stored there and you can remove or change the credit card number.
I'm pretty sure the only way to clear the map history is to go to settings>applications>Manage applications>filter>all>maps>uninstall updates and clear data. Then go to the market and reinstall updates...yea I know PITA, but you asked for it lol