You may find the following helpful to remove the cached credentials. Depending how it was added you may find it needs to be removed with one or both methods below.
1. Try using using the following command at a command prompt to view the cached credentials
net use
If you see the remote share in the list, use this command to remove it:
net use \\{server}\{share} /delete /yes
replace the tags above to match your share. Wait at least 60 seconds for it to proagate.
2. Remove it via windows credentials manager:
on the next screen
Also see these related questions:
How to add credentials to a network share in windows?
How can I archive to a shared folder on another domain?
How can I connect to a shared folder?
How to connect to a remote share in a mapping node with credentials?
