There is an option in the settings menu to 'Format Wii System Memory'. I've never tried this and don't intend to.
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Go to your Wii's memory settings and go to channels then erase save data for Netflix. Be careful to not accidentally erase the channel itself though. When you are done, open Netflix, and it will ask you to log in. Also, If you choose to sell your Wii, be sure to erase the memory of your Netflix so buyers do not get to watch for free.
You go to the settings, then Data Management, then Wii Memory, then Channels, then click on a channel, the press 'Delete' or 'Erase'.
i also have a dsi XL i also formatted the memory it will only erase photos music and songs it does not erase updates or downloads
You can do it from your wii system not the game. Go to the wii menu and in the bottom left hand corner, open wii options. Then select data management and choose the wii option. Then select the game you are trying to erase and click "erase" good luck
I think you can use a wii memory card for wii power saves. If you don't have wii memory card, you can buy one on this website: http://www.dinodirect.com