diff --git a/app/src/main/java/org/foxarmy/barcodescannerforemployees/activities/MainActivity.kt b/app/src/main/java/org/foxarmy/barcodescannerforemployees/activities/MainActivity.kt
index 00a3f82..9196876 100644
--- a/app/src/main/java/org/foxarmy/barcodescannerforemployees/activities/MainActivity.kt
+++ b/app/src/main/java/org/foxarmy/barcodescannerforemployees/activities/MainActivity.kt
@@ -151,6 +151,17 @@ class MainActivity : AppCompatActivity(), NavigationView.OnNavigationItemSelecte
         remoteCategories: JSONArray,
         localCategories: List<Category>
     ) {
+        for (localCategory in localCategories) {
+            var found = false
+            for (i in 0 until remoteCategories.length()) {
+                val remoteProduct = remoteCategories.getJSONObject(i)
+                if (remoteProduct["local_id"] == localCategory.id) {
+                    found = true
+                    break
+                }
+            }
+            if (!found) categoryDAO.eraseCategory(localCategory.id, this)
+        }
         for (i in 0 until remoteCategories.length()) {
             var categoryInRemoteDB: JSONObject? = null
             var categoryInLocalDB: Category? = null
@@ -201,6 +212,17 @@ class MainActivity : AppCompatActivity(), NavigationView.OnNavigationItemSelecte
         remoteProducts: JSONArray,
         localProducts: List<Product>
     ) {
+        for (localProduct in localProducts) {
+            var found = false
+            for (i in 0 until remoteProducts.length()) {
+                val remoteProduct = remoteProducts.getJSONObject(i)
+                if (remoteProduct["local_id"] == localProduct.id) {
+                    found = true
+                    break
+                }
+            }
+            if (!found) productDAO.eraseProduct(localProduct.id)
+        }
         for (i in 0 until remoteProducts.length()) {
             var productInRemoteDB: JSONObject? = null
             var productInLocalDB: Product? = null
@@ -259,6 +281,17 @@ class MainActivity : AppCompatActivity(), NavigationView.OnNavigationItemSelecte
         remoteAbstractProducts: JSONArray,
         localAbstractProducts: List<AbstractProduct>
     ) {
+        for (localAbstractProduct in localAbstractProducts) {
+            var found = false
+            for (i in 0 until remoteAbstractProducts.length()) {
+                val remoteAbstractProduct = remoteAbstractProducts.getJSONObject(i)
+                if (remoteAbstractProduct["local_id"] == localAbstractProduct.id) {
+                    found = true
+                    break
+                }
+            }
+            if (!found) abstractProductDAO.eraseAbstractProduct(localAbstractProduct.id, this)
+        }
         for (i in 0 until remoteAbstractProducts.length()) {
             var abstractProductInRemoteDB: JSONObject? = null
             var abstractProductInLocalDB: AbstractProduct? = null