diff --git a/spoolman/database/filament.py b/spoolman/database/filament.py
index 2c69e2d..a87f27a 100644
--- a/spoolman/database/filament.py
+++ b/spoolman/database/filament.py
@@ -5,6 +5,7 @@ from collections.abc import Sequence
 from datetime import datetime
 from typing import Optional, Union
 
+import sqlalchemy
 from sqlalchemy import func, select
 from sqlalchemy.exc import IntegrityError
 from sqlalchemy.ext.asyncio import AsyncSession
@@ -175,6 +176,13 @@ async def delete(db: AsyncSession, filament_id: int) -> None:
         raise ItemDeleteError("Failed to delete filament.") from exc
 
 
+async def clear_extra_field(db: AsyncSession, key: str) -> None:
+    """Delete all extra fields with a specific key."""
+    await db.execute(
+        sqlalchemy.delete(models.FilamentField).where(models.FilamentField.key == key),
+    )
+
+
 logger = logging.getLogger(__name__)
 
 
diff --git a/spoolman/database/spool.py b/spoolman/database/spool.py
index 3f49670..7710231 100644
--- a/spoolman/database/spool.py
+++ b/spoolman/database/spool.py
@@ -200,6 +200,13 @@ async def delete(db: AsyncSession, spool_id: int) -> None:
     await spool_changed(spool, EventType.DELETED)
 
 
+async def clear_extra_field(db: AsyncSession, key: str) -> None:
+    """Delete all extra fields with a specific key."""
+    await db.execute(
+        sqlalchemy.delete(models.SpoolField).where(models.SpoolField.key == key),
+    )
+
+
 async def use_weight_safe(db: AsyncSession, spool_id: int, weight: float) -> None:
     """Consume filament from a spool by weight in a way that is safe against race conditions.
 
diff --git a/spoolman/database/vendor.py b/spoolman/database/vendor.py
index 628a8ed..67ba082 100644
--- a/spoolman/database/vendor.py
+++ b/spoolman/database/vendor.py
@@ -3,6 +3,7 @@
 from datetime import datetime
 from typing import Optional
 
+import sqlalchemy
 from sqlalchemy import func, select
 from sqlalchemy.ext.asyncio import AsyncSession
 
@@ -106,6 +107,13 @@ async def delete(db: AsyncSession, vendor_id: int) -> None:
     await vendor_changed(vendor, EventType.DELETED)
 
 
+async def clear_extra_field(db: AsyncSession, key: str) -> None:
+    """Delete all extra fields with a specific key."""
+    await db.execute(
+        sqlalchemy.delete(models.VendorField).where(models.VendorField.key == key),
+    )
+
+
 async def vendor_changed(vendor: models.Vendor, typ: EventType) -> None:
     """Notify websocket clients that a vendor has changed."""
     await websocket_manager.send(
diff --git a/spoolman/extra_fields.py b/spoolman/extra_fields.py
index ad32284..8eb94eb 100644
--- a/spoolman/extra_fields.py
+++ b/spoolman/extra_fields.py
@@ -9,7 +9,10 @@ from fastapi.encoders import jsonable_encoder
 from pydantic import BaseModel, Field
 from sqlalchemy.ext.asyncio import AsyncSession
 
+from spoolman.database import filament as db_filament
 from spoolman.database import setting as db_setting
+from spoolman.database import spool as db_spool
+from spoolman.database import vendor as db_vendor
 from spoolman.exceptions import ItemNotFoundError
 from spoolman.settings import parse_setting
 
@@ -183,6 +186,16 @@ async def delete_extra_field(db: AsyncSession, entity_type: EntityType, key: str
     setting_def = parse_setting(f"extra_fields_{entity_type.name}")
     await db_setting.update(db=db, definition=setting_def, value=json.dumps(jsonable_encoder(extra_fields)))
 
+    # Delete the extra field for all entities
+    if entity_type == EntityType.vendor:
+        await db_vendor.clear_extra_field(db, key)
+    elif entity_type == EntityType.filament:
+        await db_filament.clear_extra_field(db, key)
+    elif entity_type == EntityType.spool:
+        await db_spool.clear_extra_field(db, key)
+    else:
+        raise ValueError(f"Unknown entity type {entity_type.name}.")
+
     logger.info("Deleted extra field %s for entity type %s.", key, entity_type.name)