I've found the answer thanks to Richard Szalay's leading and i've used the ContentPath provider as this is a common provider used by VS Publishing so the chances of having permissions is high:
var deployBaseOptions = new DeploymentBaseOptions
{
ComputerName = "https://mywebserver.com:8172/msdeploy.axd?sitename=yourIISWebsiteName",
UserName = "username",
Password = "password",
UseDelegation = true,
AuthenticationType = "Basic"
};
var syncOptions = new DeploymentSyncOptions
{
DeleteDestination = true
};
var deploymentObject = DeploymentManager.CreateObject(DeploymentWellKnownProvider.ContentPath,
"yourIISWebsiteName" + "/fileToDelete.txt",
destBaseOptions);
var results = deploymentObject.SyncTo(deployBaseOptions, syncOptions);
The weird thing is that results always shows 3 files deleted even when there is only one...?!