diff --git a/src/blenderbim/blenderbim/bim/handler.py b/src/blenderbim/blenderbim/bim/handler.py
index 5f462f8a5e..7d7d5b6bfc 100644
--- a/src/blenderbim/blenderbim/bim/handler.py
+++ b/src/blenderbim/blenderbim/bim/handler.py
@@ -52,12 +52,17 @@ def subscribe_to(object, data_path, callback):
 def purge_module_data():
     from blenderbim.bim import modules
 
-    for name in modules.keys():
+    for name, value in modules.items():
         try:
             getattr(getattr(getattr(ifcopenshell.api, name), "data"), "Data").purge()
         except AttributeError:
             pass
 
+        try:
+            getattr(value, "prop").purge()
+        except AttributeError:
+            pass
+
 
 @persistent
 def loadIfcStore(scene):
diff --git a/src/blenderbim/blenderbim/bim/module/bcf/prop.py b/src/blenderbim/blenderbim/bim/module/bcf/prop.py
index 82426afc42..5c7baa1bd1 100644
--- a/src/blenderbim/blenderbim/bim/module/bcf/prop.py
+++ b/src/blenderbim/blenderbim/bim/module/bcf/prop.py
@@ -17,6 +17,11 @@ from bpy.props import (
 bcfviewpoints_enum = None
 
 
+def purge():
+    global bcfviewpoints_enum
+    bcfviewpoints_enum = None
+
+
 def updateBcfReferenceLink(self, context):
     if bpy.context.scene.BCFProperties.is_loaded:
         bpy.ops.bim.edit_bcf_reference_links()
diff --git a/src/blenderbim/blenderbim/bim/module/bimtester/prop.py b/src/blenderbim/blenderbim/bim/module/bimtester/prop.py
index cd49e9edc1..db245767c7 100644
--- a/src/blenderbim/blenderbim/bim/module/bimtester/prop.py
+++ b/src/blenderbim/blenderbim/bim/module/bimtester/prop.py
@@ -18,6 +18,13 @@ scenarios_enum = []
 classes_enum = []
 
 
+def purge():
+    global scenarios_enum
+    global classes_enum
+    scenarios_enum = []
+    classes_enum = []
+
+
 def getScenarios(self, context):
     global scenarios_enum
     if len(scenarios_enum) < 1:
diff --git a/src/blenderbim/blenderbim/bim/module/classification/prop.py b/src/blenderbim/blenderbim/bim/module/classification/prop.py
index 85ffb7ce8b..932335a3a3 100644
--- a/src/blenderbim/blenderbim/bim/module/classification/prop.py
+++ b/src/blenderbim/blenderbim/bim/module/classification/prop.py
@@ -16,6 +16,11 @@ from bpy.props import (
 classification_enum = []
 
 
+def purge():
+    global classification_enum
+    classification_enum = []
+
+
 def getClassifications(self, context):
     global classification_enum
     if len(classification_enum) < 1:
diff --git a/src/blenderbim/blenderbim/bim/module/material/prop.py b/src/blenderbim/blenderbim/bim/module/material/prop.py
index ffa7c5d87a..6b39d95691 100644
--- a/src/blenderbim/blenderbim/bim/module/material/prop.py
+++ b/src/blenderbim/blenderbim/bim/module/material/prop.py
@@ -21,6 +21,17 @@ profileclasses_enum = []
 parameterizedprofileclasses_enum = []
 
 
+def purge():
+    global materials_enum
+    global materialtypes_enum
+    global profileclasses_enum
+    global parameterizedprofileclasses_enum
+    materials_enum = []
+    materialtypes_enum = []
+    profileclasses_enum = []
+    parameterizedprofileclasses_enum = []
+
+
 def getProfileClasses(self, context):
     global profileclasses_enum
     if len(profileclasses_enum) == 0 and IfcStore.get_schema():
diff --git a/src/blenderbim/blenderbim/bim/module/patch/prop.py b/src/blenderbim/blenderbim/bim/module/patch/prop.py
index b2d4315878..bfee66f4b0 100644
--- a/src/blenderbim/blenderbim/bim/module/patch/prop.py
+++ b/src/blenderbim/blenderbim/bim/module/patch/prop.py
@@ -18,6 +18,11 @@ from bpy.props import (
 ifcpatchrecipes_enum = []
 
 
+def purge():
+    global ifcpatchrecipes_enum
+    ifcpatchrecipes_enum = []
+
+
 def getIfcPatchRecipes(self, context):
     global ifcpatchrecipes_enum
     if len(ifcpatchrecipes_enum) < 1:
diff --git a/src/blenderbim/blenderbim/bim/module/pset/prop.py b/src/blenderbim/blenderbim/bim/module/pset/prop.py
index 42c2904e8a..d4dcbb75c9 100644
--- a/src/blenderbim/blenderbim/bim/module/pset/prop.py
+++ b/src/blenderbim/blenderbim/bim/module/pset/prop.py
@@ -19,6 +19,13 @@ psetnames = {}
 qtonames = {}
 
 
+def purge():
+    global psetnames
+    global qtonames
+    psetnames = {}
+    qtonames = {}
+
+
 def getPsetNames(self, context):
     global psetnames
     obj = context.active_object
diff --git a/src/blenderbim/blenderbim/bim/module/pset_template/prop.py b/src/blenderbim/blenderbim/bim/module/pset_template/prop.py
index 9a570bf5a0..36b8bc8c05 100644
--- a/src/blenderbim/blenderbim/bim/module/pset_template/prop.py
+++ b/src/blenderbim/blenderbim/bim/module/pset_template/prop.py
@@ -21,6 +21,13 @@ psettemplatefiles_enum = []
 psettemplates_enum = []
 
 
+def purge():
+    global psettemplatefiles_enum
+    global psettemplates_enum
+    psettemplatefiles_enum = []
+    psettemplates_enum = []
+
+
 def updatePsetTemplateFiles(self, context):
     global psettemplates_enum
     IfcStore.pset_template_path = os.path.join(
diff --git a/src/blenderbim/blenderbim/bim/module/root/prop.py b/src/blenderbim/blenderbim/bim/module/root/prop.py
index 20a4b63fec..80ba2a20e4 100644
--- a/src/blenderbim/blenderbim/bim/module/root/prop.py
+++ b/src/blenderbim/blenderbim/bim/module/root/prop.py
@@ -17,6 +17,15 @@ classes_enum = []
 types_enum = []
 
 
+def purge():
+    global products_enum
+    global classes_enum
+    global types_enum
+    products_enum = []
+    classes_enum = []
+    types_enum = []
+
+
 def getIfcPredefinedTypes(self, context):
     global types_enum
     file = IfcStore.get_file()
diff --git a/src/blenderbim/blenderbim/bim/module/type/prop.py b/src/blenderbim/blenderbim/bim/module/type/prop.py
index 9fdce92635..bb895a7a36 100644
--- a/src/blenderbim/blenderbim/bim/module/type/prop.py
+++ b/src/blenderbim/blenderbim/bim/module/type/prop.py
@@ -20,6 +20,17 @@ type_classes_enum = []
 available_types_enum = []
 
 
+def purge():
+    global applicable_types_enum
+    global relating_types_enum
+    global type_classes_enum
+    global available_types_enum
+    applicable_types_enum = []
+    relating_types_enum = []
+    type_classes_enum = []
+    available_types_enum = []
+
+
 def getIfcTypes(self, context):
     global type_classes_enum
     file = IfcStore.get_file()