diff --git a/windows/welcome/src/SilverOS.Welcome.Core/Apply/ApplyService.cs b/windows/welcome/src/SilverOS.Welcome.Core/Apply/ApplyService.cs
index 8571878..8e1fa3f 100644
--- a/windows/welcome/src/SilverOS.Welcome.Core/Apply/ApplyService.cs
+++ b/windows/welcome/src/SilverOS.Welcome.Core/Apply/ApplyService.cs
@@ -33,6 +33,7 @@ public sealed class ApplyService(IProcessRunner runner, IAccountService accounts
         await bitlocker.EnableAsync(req.BitLockerPin, ct);
 
         progress.Report(new("Finishing up", 95));
+        await bootstrap.RevertKioskAsync(ct);                   // revert kiosk before account deletion (SID must still resolve)
         await bootstrap.TearDownAsync(req.BootstrapUser, ct);   // last — only after success
         progress.Report(new("Done", 100));
     }
diff --git a/windows/welcome/src/SilverOS.Welcome.Core/Apply/BootstrapService.cs b/windows/welcome/src/SilverOS.Welcome.Core/Apply/BootstrapService.cs
index e367dcf..0e2c1a5 100644
--- a/windows/welcome/src/SilverOS.Welcome.Core/Apply/BootstrapService.cs
+++ b/windows/welcome/src/SilverOS.Welcome.Core/Apply/BootstrapService.cs
@@ -1,6 +1,25 @@
 namespace SilverOS.Welcome.Core.Apply;
 public sealed class BootstrapService(IProcessRunner runner) : IBootstrapService
 {
+    public async Task RevertKioskAsync(CancellationToken ct = default)
+    {
+        // Remove sm-bootstrap custom shell entry + disable Shell Launcher's per-user entry.
+        await Ps(
+            "$c='root\\\\standardcimv2\\\\embedded';" +
+            "$w=Get-CimInstance -Namespace $c -ClassName WESL_UserSetting -EA SilentlyContinue;" +
+            "if($w){" +
+              "$sid=(New-Object System.Security.Principal.NTAccount('sm-bootstrap')).Translate([System.Security.Principal.SecurityIdentifier]).Value;" +
+              "Invoke-CimMethod -InputObject $w -MethodName RemoveCustomShell -Arguments @{Sid=$sid} -EA SilentlyContinue | Out-Null;" +
+              "Invoke-CimMethod -InputObject $w -MethodName SetEnabled -Arguments @{Enabled=$false} -EA SilentlyContinue | Out-Null" +
+            "}",
+            "Revert Shell Launcher", ct);
+        // Revert escape policies set by Configure-Kiosk.ps1.
+        await Ps(
+            "$s='HKLM:\\\\SOFTWARE\\\\Microsoft\\\\Windows\\\\CurrentVersion\\\\Policies\\\\System';" +
+            "Remove-ItemProperty $s -Name DisableTaskMgr,DisableLockWorkstation,HideFastUserSwitching -EA SilentlyContinue",
+            "Revert escape policies", ct);
+    }
+
     public async Task TearDownAsync(string bootstrapUser, CancellationToken ct = default)
     {
         const string key = "'HKLM:\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon'";
diff --git a/windows/welcome/src/SilverOS.Welcome.Core/Apply/IBootstrapService.cs b/windows/welcome/src/SilverOS.Welcome.Core/Apply/IBootstrapService.cs
index 7fef74f..5e48d5b 100644
--- a/windows/welcome/src/SilverOS.Welcome.Core/Apply/IBootstrapService.cs
+++ b/windows/welcome/src/SilverOS.Welcome.Core/Apply/IBootstrapService.cs
@@ -1,2 +1,6 @@
 namespace SilverOS.Welcome.Core.Apply;
-public interface IBootstrapService { Task TearDownAsync(string bootstrapUser, CancellationToken ct = default); }
+public interface IBootstrapService
+{
+    Task RevertKioskAsync(CancellationToken ct = default);
+    Task TearDownAsync(string bootstrapUser, CancellationToken ct = default);
+}
diff --git a/windows/welcome/tests/SilverOS.Welcome.Tests/BootstrapServiceRevertKioskTests.cs b/windows/welcome/tests/SilverOS.Welcome.Tests/BootstrapServiceRevertKioskTests.cs
new file mode 100644
index 0000000..198b51e
--- /dev/null
+++ b/windows/welcome/tests/SilverOS.Welcome.Tests/BootstrapServiceRevertKioskTests.cs
@@ -0,0 +1,99 @@
+using Moq;
+using SilverOS.Welcome.Core.Apply;
+
+public class BootstrapServiceRevertKioskTests
+{
+    private static Mock<IProcessRunner> Ok()
+    {
+        var m = new Mock<IProcessRunner>();
+        m.Setup(r => r.RunAsync(It.IsAny<string>(), It.IsAny<string>(), It.IsAny<CancellationToken>()))
+         .ReturnsAsync(new ProcessResult(0, "", ""));
+        return m;
+    }
+
+    private static Mock<IProcessRunner> Fail()
+    {
+        var m = new Mock<IProcessRunner>();
+        m.Setup(r => r.RunAsync(It.IsAny<string>(), It.IsAny<string>(), It.IsAny<CancellationToken>()))
+         .ReturnsAsync(new ProcessResult(1, "", "the operation failed"));
+        return m;
+    }
+
+    [Fact]
+    public async Task RevertKioskAsync_throws_on_nonzero_exit()
+    {
+        await Assert.ThrowsAsync<InvalidOperationException>(() =>
+            new BootstrapService(Fail().Object).RevertKioskAsync());
+    }
+
+    [Fact]
+    public async Task RevertKioskAsync_removes_custom_shell_and_disables_shell_launcher()
+    {
+        var run = Ok();
+        await new BootstrapService(run.Object).RevertKioskAsync();
+        // First call: Shell Launcher revert — must reference WESL_UserSetting and RemoveCustomShell + SetEnabled.
+        run.Verify(r => r.RunAsync("powershell.exe", It.Is<string>(s =>
+            s.Contains("WESL_UserSetting") &&
+            s.Contains("RemoveCustomShell") &&
+            s.Contains("SetEnabled")),
+            It.IsAny<CancellationToken>()), Times.Once);
+    }
+
+    [Fact]
+    public async Task RevertKioskAsync_reverts_escape_policies()
+    {
+        var run = Ok();
+        await new BootstrapService(run.Object).RevertKioskAsync();
+        // Second call: policy revert — must remove the three escape policy values.
+        run.Verify(r => r.RunAsync("powershell.exe", It.Is<string>(s =>
+            s.Contains("Remove-ItemProperty") &&
+            s.Contains("DisableTaskMgr") &&
+            s.Contains("DisableLockWorkstation") &&
+            s.Contains("HideFastUserSwitching")),
+            It.IsAny<CancellationToken>()), Times.Once);
+    }
+
+    [Fact]
+    public async Task ApplyService_calls_revert_kiosk_before_teardown()
+    {
+        var order = new List<string>();
+        var run = new Mock<IProcessRunner>();
+        run.Setup(r => r.RunAsync(It.IsAny<string>(), It.IsAny<string>(), It.IsAny<CancellationToken>()))
+           .Callback<string, string, CancellationToken>((_, a, _) =>
+           {
+               if (a.Contains("Invoke-Hardening")) order.Add("modules");
+           })
+           .ReturnsAsync(new ProcessResult(0, "", ""));
+
+        var acct = new Mock<IAccountService>();
+        acct.Setup(a => a.CreateAccountsAsync(It.IsAny<string>(), It.IsAny<string>(), It.IsAny<string>(), It.IsAny<CancellationToken>()))
+            .Callback(() => order.Add("accounts"))
+            .Returns(Task.CompletedTask);
+
+        var bl = new Mock<IBitLockerService>();
+        bl.Setup(b => b.EnableAsync(It.IsAny<string>(), It.IsAny<CancellationToken>()))
+          .Callback(() => order.Add("bitlocker"))
+          .Returns(Task.CompletedTask);
+
+        var boot = new Mock<IBootstrapService>();
+        boot.Setup(b => b.RevertKioskAsync(It.IsAny<CancellationToken>()))
+            .Callback(() => order.Add("revert-kiosk"))
+            .Returns(Task.CompletedTask);
+        boot.Setup(b => b.TearDownAsync(It.IsAny<string>(), It.IsAny<CancellationToken>()))
+            .Callback(() => order.Add("teardown"))
+            .Returns(Task.CompletedTask);
+
+        var sut = new ApplyService(run.Object, acct.Object, bl.Object, boot.Object, "C:\\hard");
+        var flavour = new SilverOS.Welcome.Core.Flavours.FlavourManifest
+        {
+            Id = "daily-driver",
+            Hardening = new SilverOS.Welcome.Core.Flavours.HardeningSpec { Modules = new[] { "00" } }
+        };
+        var req = new ApplyRequest(flavour, "alice", "pw", "adminpw", "123456", "sm-bootstrap");
+
+        await sut.RunAsync(req, new Progress<ApplyProgress>(_ => { }));
+
+        // revert-kiosk must precede teardown so the sm-bootstrap SID still resolves.
+        Assert.Equal(new[] { "modules", "accounts", "bitlocker", "revert-kiosk", "teardown" }, order);
+    }
+}