At where Sql Management Studio saved all Login Name & Password

In SQL Management Studio all login name & password and server name are stored in a file and its name is “SqlStudio.bin” and its location is “%AppData%\Microsoft\Microsoft SQL Server\100\Tools\Shell\” OR “AppData\Roaming\Microsoft\SQL Server Management Studio\11.0\” OR any other location because location is depends on SQL Server Version. But remember its file name is common n all versions so you can search this file by using windows serach feature in your AppData folder.
You can check this file and if you want to delete all SQL server details from any system please remove this file. You can’t remove any single server details from this file because encrypted and this encrypted language is not understandable by us.