diff --git a/src/kcms/tabbox/thumbnailitem.cpp b/src/kcms/tabbox/thumbnailitem.cpp
index ea34086a2b..b868fe6ef8 100644
--- a/src/kcms/tabbox/thumbnailitem.cpp
+++ b/src/kcms/tabbox/thumbnailitem.cpp
@@ -21,9 +21,6 @@ WindowThumbnailItem::WindowThumbnailItem(QQuickItem *parent)
     : QQuickItem(parent)
     , m_wId(0)
     , m_image()
-    , m_clipToItem(nullptr)
-    , m_brightness(1.0)
-    , m_saturation(1.0)
     , m_sourceSize(QSize())
 {
     setFlag(ItemHasContents);
@@ -40,11 +37,6 @@ void WindowThumbnailItem::setWId(qulonglong wId)
     findImage();
 }
 
-void WindowThumbnailItem::setClipTo(QQuickItem *clip)
-{
-    qWarning() << "ThumbnailItem.clipTo is removed and it has no replacements";
-}
-
 void WindowThumbnailItem::findImage()
 {
     QString imagePath;
@@ -101,31 +93,11 @@ QSGNode *WindowThumbnailItem::updatePaintNode(QSGNode *oldNode, UpdatePaintNodeD
     return node;
 }
 
-qreal WindowThumbnailItem::brightness() const
-{
-    return m_brightness;
-}
-
-qreal WindowThumbnailItem::saturation() const
-{
-    return m_saturation;
-}
-
 QSize WindowThumbnailItem::sourceSize() const
 {
     return m_sourceSize;
 }
 
-void WindowThumbnailItem::setBrightness(qreal brightness)
-{
-    qWarning() << "ThumbnailItem.brightness is removed. Use a shader effect to change brightness";
-}
-
-void WindowThumbnailItem::setSaturation(qreal saturation)
-{
-    qWarning() << "ThumbnailItem.saturation is removed. Use a shader effect to change saturation";
-}
-
 void WindowThumbnailItem::setSourceSize(const QSize &size)
 {
     if (m_sourceSize == size) {
diff --git a/src/kcms/tabbox/thumbnailitem.h b/src/kcms/tabbox/thumbnailitem.h
index f5da4f4a95..fb9225845a 100644
--- a/src/kcms/tabbox/thumbnailitem.h
+++ b/src/kcms/tabbox/thumbnailitem.h
@@ -19,21 +19,6 @@ class WindowThumbnailItem : public QQuickItem
 {
     Q_OBJECT
     Q_PROPERTY(qulonglong wId READ wId WRITE setWId NOTIFY wIdChanged SCRIPTABLE true)
-    /**
-     * TODO Plasma 6: Remove.
-     * @deprecated clipTo has no replacement
-     */
-    Q_PROPERTY(QQuickItem *clipTo READ clipTo WRITE setClipTo NOTIFY clipToChanged)
-    /**
-     * TODO Plasma 6: Remove.
-     * @deprecated use a shader effect to change the brightness
-     */
-    Q_PROPERTY(qreal brightness READ brightness WRITE setBrightness NOTIFY brightnessChanged)
-    /**
-     * TODO Plasma 6: Remove.
-     * @deprecated use a shader effect to change color saturation
-     */
-    Q_PROPERTY(qreal saturation READ saturation WRITE setSaturation NOTIFY saturationChanged)
     Q_PROPERTY(QSize sourceSize READ sourceSize WRITE setSourceSize NOTIFY sourceSizeChanged)
 public:
     explicit WindowThumbnailItem(QQuickItem *parent = nullptr);
@@ -43,17 +28,8 @@ public:
     {
         return m_wId;
     }
-    QQuickItem *clipTo() const
-    {
-        return m_clipToItem;
-    }
-    qreal brightness() const;
-    qreal saturation() const;
     QSize sourceSize() const;
     void setWId(qulonglong wId);
-    void setClipTo(QQuickItem *clip);
-    void setBrightness(qreal brightness);
-    void setSaturation(qreal saturation);
     void setSourceSize(const QSize &size);
     QSGNode *updatePaintNode(QSGNode *oldNode, UpdatePaintNodeData *updatePaintNodeData) override;
 
@@ -66,18 +42,12 @@ public:
     };
 Q_SIGNALS:
     void wIdChanged(qulonglong wid);
-    void clipToChanged();
-    void brightnessChanged();
-    void saturationChanged();
     void sourceSizeChanged();
 
 private:
     void findImage();
     qulonglong m_wId;
     QImage m_image;
-    QQuickItem *m_clipToItem;
-    qreal m_brightness;
-    qreal m_saturation;
     QSize m_sourceSize;
 };
 
diff --git a/src/scripting/windowthumbnailitem.cpp b/src/scripting/windowthumbnailitem.cpp
index a7ab64ed32..bc8e571ed2 100644
--- a/src/scripting/windowthumbnailitem.cpp
+++ b/src/scripting/windowthumbnailitem.cpp
@@ -256,36 +256,6 @@ QSGNode *WindowThumbnailItem::updatePaintNode(QSGNode *oldNode, QQuickItem::Upda
     return node;
 }
 
-qreal WindowThumbnailItem::saturation() const
-{
-    return 1;
-}
-
-void WindowThumbnailItem::setSaturation(qreal saturation)
-{
-    qCWarning(KWIN_SCRIPTING) << "ThumbnailItem.saturation is removed. Use a shader effect to change saturation";
-}
-
-qreal WindowThumbnailItem::brightness() const
-{
-    return 1;
-}
-
-void WindowThumbnailItem::setBrightness(qreal brightness)
-{
-    qCWarning(KWIN_SCRIPTING) << "ThumbnailItem.brightness is removed. Use a shader effect to change brightness";
-}
-
-QQuickItem *WindowThumbnailItem::clipTo() const
-{
-    return nullptr;
-}
-
-void WindowThumbnailItem::setClipTo(QQuickItem *clip)
-{
-    qCWarning(KWIN_SCRIPTING) << "ThumbnailItem.clipTo is removed and it has no replacements";
-}
-
 QUuid WindowThumbnailItem::wId() const
 {
     return m_wId;
diff --git a/src/scripting/windowthumbnailitem.h b/src/scripting/windowthumbnailitem.h
index 251fe03c8c..2af939e12f 100644
--- a/src/scripting/windowthumbnailitem.h
+++ b/src/scripting/windowthumbnailitem.h
@@ -24,23 +24,7 @@ class WindowThumbnailItem : public QQuickItem
     Q_OBJECT
     Q_PROPERTY(QUuid wId READ wId WRITE setWId NOTIFY wIdChanged)
     Q_PROPERTY(KWin::Window *client READ client WRITE setClient NOTIFY clientChanged)
-
     Q_PROPERTY(QSize sourceSize READ sourceSize WRITE setSourceSize NOTIFY sourceSizeChanged)
-    /**
-     * TODO Plasma 6: Remove.
-     * @deprecated use a shader effect to change the brightness
-     */
-    Q_PROPERTY(qreal brightness READ brightness WRITE setBrightness NOTIFY brightnessChanged)
-    /**
-     * TODO Plasma 6: Remove.
-     * @deprecated use a shader effect to change color saturation
-     */
-    Q_PROPERTY(qreal saturation READ saturation WRITE setSaturation NOTIFY saturationChanged)
-    /**
-     * TODO Plasma 6: Remove.
-     * @deprecated clipTo has no replacement
-     */
-    Q_PROPERTY(QQuickItem *clipTo READ clipTo WRITE setClipTo NOTIFY clipToChanged)
 
 public:
     explicit WindowThumbnailItem(QQuickItem *parent = nullptr);
@@ -52,15 +36,6 @@ public:
     Window *client() const;
     void setClient(Window *client);
 
-    qreal brightness() const;
-    void setBrightness(qreal brightness);
-
-    qreal saturation() const;
-    void setSaturation(qreal saturation);
-
-    QQuickItem *clipTo() const;
-    void setClipTo(QQuickItem *clip);
-
     QSize sourceSize() const;
     void setSourceSize(const QSize &sourceSize);
 
@@ -74,9 +49,6 @@ protected:
 Q_SIGNALS:
     void wIdChanged();
     void clientChanged();
-    void brightnessChanged();
-    void saturationChanged();
-    void clipToChanged();
     void sourceSizeChanged();
 
 private: