diff --git a/src/services/Customers.php b/src/services/Customers.php
index 7631961..969e970 100644
--- a/src/services/Customers.php
+++ b/src/services/Customers.php
@@ -1,4 +1,5 @@
 <?php
+
 /**
  * @link https://craftcms.com/
  * @copyright Copyright (c) Pixel & Tonic, Inc.
@@ -57,13 +58,23 @@ public function syncAllCustomers(): int
         $api = Plugin::getInstance()->getApi();
         $customers = $api->fetchAllCustomers();
 
+        $stripeIds = [];
+
         $count = 0;
         foreach ($customers as $customer) {
+            $stripeIds[] = $customer->id;
             if ($this->createOrUpdateCustomer($customer)) {
                 $count++;
             }
         }
 
+        // Delete non existent customers
+        $customerDataRecord = CustomerDataRecord::find()->where(['not in', 'stripeId', $stripeIds])->all();
+        
+        foreach ($customerDataRecord as $record) {
+            $record->delete();
+        }
+
         return $count;
     }
 
diff --git a/src/services/Invoices.php b/src/services/Invoices.php
index cffe86f..e793882 100644
--- a/src/services/Invoices.php
+++ b/src/services/Invoices.php
@@ -58,13 +58,23 @@ public function syncAllInvoices(): int
         $api = Plugin::getInstance()->getApi();
         $invoices = $api->fetchAllInvoices();
 
+        $stripeIds = [];
+
         $count = 0;
         foreach ($invoices as $invoice) {
+            $stripeIds[] = $invoice->id;
             if ($this->createOrUpdateInvoice($invoice)) {
                 $count++;
             }
         }
 
+        // Delete non existent invoices
+        $invoiceDataRecord = InvoiceDataRecord::find()->where(['not in', 'stripeId', $stripeIds])->all();
+        
+        foreach ($invoiceDataRecord as $record) {
+            $record->delete();
+        }
+
         return $count;
     }