How to remove Cydia sources
In order to remove unnecessary Cydia sources, follow the steps given below:
Step 1: As a first step, you first need to download the iPhone browser. Click to download the iPhone Browser from this link: http://code.google.com/p/iphonebrowser/downloads/list
Step 2: Click on the exe file to install the application. Once the application is installed, launch it from Start Menu > Programs > iPhoneBrowser.
Step 3: Once the iPhoneBrowser starts, it will start searching for the iPhone. Make sure that your iPhone is connected to the computer and also unlock the iPhone with the pass code, if any.
Step 4: Now, in the root section, move to etc > app > sources.list.d. On the right side of the iPhoneBrowser application screen you will notice the list of sources that have been added to Cydia so far. Click on any of the sources that you want to remove or have been corrupted and press the delete key to remove that source.
Alternatively, you can right click on the source you want to remove and then click Delete File. Restart your iPhone once done.