diff --git a/effects/slide/slide.h b/effects/slide/slide.h
--- a/effects/slide/slide.h
+++ b/effects/slide/slide.h
@@ -40,6 +40,7 @@
 
 public:
     SlideEffect();
+    ~SlideEffect() override;
 
     void reconfigure(ReconfigureFlags) override;
 
@@ -82,9 +83,6 @@
 
     bool isTranslated(const EffectWindow *w) const;
     bool isPainted(const EffectWindow *w) const;
-
-    bool shouldForceBlur(const EffectWindow *w) const;
-    bool shouldForceBackgroundContrast(const EffectWindow *w) const;
     bool shouldElevate(const EffectWindow *w) const;
 
     void start(int old, int current, EffectWindow *movingWindow = nullptr);
@@ -111,11 +109,6 @@
         EffectWindowList fullscreenWindows;
     } m_paintCtx;
 
-    struct {
-        EffectWindowList blur;
-        EffectWindowList backgroundContrast;
-    } m_forcedRoles;
-
     EffectWindowList m_elevatedWindows;
 };
 
diff --git a/effects/slide/slide.cpp b/effects/slide/slide.cpp
--- a/effects/slide/slide.cpp
+++ b/effects/slide/slide.cpp
@@ -26,11 +26,6 @@
 // KConfigSkeleton
 #include "slideconfig.h"
 
-// KWayland
-#include <KWayland/Server/blur_interface.h>
-#include <KWayland/Server/contrast_interface.h>
-#include <KWayland/Server/surface_interface.h>
-
 namespace KWin
 {
 
@@ -53,6 +48,13 @@
             this, &SlideEffect::numberScreensChanged);
 }
 
+SlideEffect::~SlideEffect()
+{
+    if (m_active) {
+        stop();
+    }
+}
+
 bool SlideEffect::supported()
 {
     return effects->animationsSupported();
@@ -334,70 +336,6 @@
     return h;
 }
 
-bool SlideEffect::shouldForceBlur(const EffectWindow *w) const
-{
-    // While there is an active fullscreen effect, the blur effect
-    // tends to do nothing, i.e. it doesn't blur behind windows.
-    // So, we should force the blur effect to blur by setting
-    // WindowForceBlurRole.
-
-    if (w->data(WindowForceBlurRole).toBool()) {
-        return false;
-    }
-
-    if (w->data(WindowBlurBehindRole).isValid()) {
-        return true;
-    }
-
-    if (w->decorationHasAlpha() && effects->decorationSupportsBlurBehind()) {
-        return true;
-    }
-
-    // FIXME: it should be something like this:
-    //        if (surf) {
-    //            return !surf->blur().isNull();
-    //        }
-    const KWayland::Server::SurfaceInterface *surf = w->surface();
-    if (surf && surf->blur()) {
-        return true;
-    }
-
-    // TODO: make it X11-specific(check _KDE_NET_WM_BLUR_BEHIND_REGION)
-    //       or delete it in the future
-    return w->hasAlpha();
-}
-
-bool SlideEffect::shouldForceBackgroundContrast(const EffectWindow *w) const
-{
-    // While there is an active fullscreen effect, the background
-    // contrast effect tends to do nothing, i.e. it doesn't change
-    // contrast. So, we should force the background contrast effect
-    // to change contrast by setting WindowForceBackgroundContrastRole.
-
-    if (w->data(WindowForceBackgroundContrastRole).toBool()) {
-        return false;
-    }
-
-    if (w->data(WindowBackgroundContrastRole).isValid()) {
-        return true;
-    }
-
-    // FIXME: it should be something like this:
-    //        if (surf) {
-    //            return !surf->contrast().isNull();
-    //        }
-    const KWayland::Server::SurfaceInterface *surf = w->surface();
-    if (surf && surf->contrast()) {
-        return true;
-    }
-
-    // TODO: make it X11-specific(check _KDE_NET_WM_BACKGROUND_CONTRAST_REGION)
-    //       or delete it in the future
-    return w->hasAlpha()
-        && w->isOnAllDesktops()
-        && (w->isDock() || w->keepAbove());
-}
-
 bool SlideEffect::shouldElevate(const EffectWindow *w) const
 {
     // Static docks(i.e. this effect doesn't slide docks) should be elevated
@@ -430,18 +368,12 @@
 
     const auto windows = effects->stackingOrder();
     for (EffectWindow *w : windows) {
-        if (shouldForceBlur(w)) {
-            w->setData(WindowForceBlurRole, QVariant(true));
-            m_forcedRoles.blur << w;
-        }
-        if (shouldForceBackgroundContrast(w)) {
-            w->setData(WindowForceBackgroundContrastRole, QVariant(true));
-            m_forcedRoles.backgroundContrast << w;
-        }
         if (shouldElevate(w)) {
             effects->setElevatedWindow(w, true);
             m_elevatedWindows << w;
         }
+        w->setData(WindowForceBackgroundContrastRole, QVariant(true));
+        w->setData(WindowForceBlurRole, QVariant(true));
     }
 
     m_diff = desktopCoords(current) - desktopCoords(old);
@@ -457,15 +389,11 @@
 
 void SlideEffect::stop()
 {
-    for (EffectWindow *w : m_forcedRoles.blur) {
-        w->setData(WindowForceBlurRole, QVariant());
-    }
-    m_forcedRoles.blur.clear();
-
-    for (EffectWindow *w : m_forcedRoles.backgroundContrast) {
+    const EffectWindowList windows = effects->stackingOrder();
+    for (EffectWindow *w : windows) {
         w->setData(WindowForceBackgroundContrastRole, QVariant());
+        w->setData(WindowForceBlurRole, QVariant());
     }
-    m_forcedRoles.backgroundContrast.clear();
 
     for (EffectWindow *w : m_elevatedWindows) {
         effects->setElevatedWindow(w, false);
@@ -491,18 +419,12 @@
     if (!m_active) {
         return;
     }
-    if (shouldForceBlur(w)) {
-        w->setData(WindowForceBlurRole, QVariant(true));
-        m_forcedRoles.blur << w;
-    }
-    if (shouldForceBackgroundContrast(w)) {
-        w->setData(WindowForceBackgroundContrastRole, QVariant(true));
-        m_forcedRoles.backgroundContrast << w;
-    }
     if (shouldElevate(w)) {
         effects->setElevatedWindow(w, true);
         m_elevatedWindows << w;
     }
+    w->setData(WindowForceBackgroundContrastRole, QVariant(true));
+    w->setData(WindowForceBlurRole, QVariant(true));
 }
 
 void SlideEffect::windowDeleted(EffectWindow *w)
@@ -513,8 +435,6 @@
     if (w == m_movingWindow) {
         m_movingWindow = nullptr;
     }
-    m_forcedRoles.blur.removeAll(w);
-    m_forcedRoles.backgroundContrast.removeAll(w);
     m_elevatedWindows.removeAll(w);
     m_paintCtx.fullscreenWindows.removeAll(w);
 }