diff --git a/src/csharp/build_unitypackage.bat b/src/csharp/build_unitypackage.bat
index a40eddddf2e..f29bd98b5a2 100644
--- a/src/csharp/build_unitypackage.bat
+++ b/src/csharp/build_unitypackage.bat
@@ -64,7 +64,6 @@ copy /Y nativelibs\csharp_ext_macos_ios\libgrpc.a unitypackage\unitypackage_skel
 
 @rem add gRPC dependencies
 @rem TODO(jtattermusch): also include XMLdoc
-copy /Y Grpc.Core\bin\Release\net45\System.Interactive.Async.dll unitypackage\unitypackage_skeleton\Plugins\System.Interactive.Async\lib\net45\System.Interactive.Async.dll || goto :error
 copy /Y Grpc.Core\bin\Release\net45\System.Runtime.CompilerServices.Unsafe.dll unitypackage\unitypackage_skeleton\Plugins\System.Runtime.CompilerServices.Unsafe\lib\net45\System.Runtime.CompilerServices.Unsafe.dll || goto :error
 copy /Y Grpc.Core\bin\Release\net45\System.Buffers.dll unitypackage\unitypackage_skeleton\Plugins\System.Buffers\lib\net45\System.Buffers.dll || goto :error
 copy /Y Grpc.Core\bin\Release\net45\System.Memory.dll unitypackage\unitypackage_skeleton\Plugins\System.Memory\lib\net45\System.Memory.dll || goto :error
diff --git a/src/csharp/experimental/build_unitypackage.sh b/src/csharp/experimental/build_unitypackage.sh
deleted file mode 100755
index cca52658e85..00000000000
--- a/src/csharp/experimental/build_unitypackage.sh
+++ /dev/null
@@ -1,32 +0,0 @@
-#!/bin/sh
-# Copyright 2018 gRPC authors.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-# Builds an experimental .unitypackage file to be imported into Unity projects.
-
-set -ex
-
-cd "$(dirname "$0")/.."
-
-dotnet restore Grpc.sln
-
-mkdir -p GrpcUnity
-dotnet build --configuration Release --framework net45 Grpc.Core --output ../GrpcUnity
-
-#TODO: add ThirdParty/Grpc.Core:
-# - assembly
-# - native libraries (mac dylib need to be renamed to grpc_csharp_ext.bundle)
-
-#TODO: add ThirdParty/Grpc.Tools:
-# - protoc and grpc plugin
diff --git a/src/csharp/unitypackage/unitypackage_skeleton/Plugins/System.Interactive.Async.meta b/src/csharp/unitypackage/unitypackage_skeleton/Plugins/System.Interactive.Async.meta
deleted file mode 100644
index 6f1b910534d..00000000000
--- a/src/csharp/unitypackage/unitypackage_skeleton/Plugins/System.Interactive.Async.meta
+++ /dev/null
@@ -1,10 +0,0 @@
-fileFormatVersion: 2
-guid: b2ba2199282e9c641bc2e611f1e776a0
-folderAsset: yes
-timeCreated: 1531219385
-licenseType: Free
-DefaultImporter:
-  externalObjects: {}
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: 
diff --git a/src/csharp/unitypackage/unitypackage_skeleton/Plugins/System.Interactive.Async/lib.meta b/src/csharp/unitypackage/unitypackage_skeleton/Plugins/System.Interactive.Async/lib.meta
deleted file mode 100644
index d7ae012a397..00000000000
--- a/src/csharp/unitypackage/unitypackage_skeleton/Plugins/System.Interactive.Async/lib.meta
+++ /dev/null
@@ -1,10 +0,0 @@
-fileFormatVersion: 2
-guid: bd5ddd2522dc301488ffe002106fe0ab
-folderAsset: yes
-timeCreated: 1531219385
-licenseType: Free
-DefaultImporter:
-  externalObjects: {}
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: 
diff --git a/src/csharp/unitypackage/unitypackage_skeleton/Plugins/System.Interactive.Async/lib/net45.meta b/src/csharp/unitypackage/unitypackage_skeleton/Plugins/System.Interactive.Async/lib/net45.meta
deleted file mode 100644
index 9b1748d3e76..00000000000
--- a/src/csharp/unitypackage/unitypackage_skeleton/Plugins/System.Interactive.Async/lib/net45.meta
+++ /dev/null
@@ -1,10 +0,0 @@
-fileFormatVersion: 2
-guid: a68443518bcd1d44ba88a871dcab0c83
-folderAsset: yes
-timeCreated: 1531219385
-licenseType: Free
-DefaultImporter:
-  externalObjects: {}
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: 
diff --git a/src/csharp/unitypackage/unitypackage_skeleton/Plugins/System.Interactive.Async/lib/net45/System.Interactive.Async.dll.meta b/src/csharp/unitypackage/unitypackage_skeleton/Plugins/System.Interactive.Async/lib/net45/System.Interactive.Async.dll.meta
deleted file mode 100644
index bb910fe9229..00000000000
--- a/src/csharp/unitypackage/unitypackage_skeleton/Plugins/System.Interactive.Async/lib/net45/System.Interactive.Async.dll.meta
+++ /dev/null
@@ -1,32 +0,0 @@
-fileFormatVersion: 2
-guid: 4c05e46cbf00c68408f5ddc1eef9ae3b
-timeCreated: 1531219386
-licenseType: Free
-PluginImporter:
-  externalObjects: {}
-  serializedVersion: 2
-  iconMap: {}
-  executionOrder: {}
-  isPreloaded: 0
-  isOverridable: 0
-  platformData:
-  - first:
-      Any: 
-    second:
-      enabled: 1
-      settings: {}
-  - first:
-      Editor: Editor
-    second:
-      enabled: 0
-      settings:
-        DefaultValueInitialized: true
-  - first:
-      Windows Store Apps: WindowsStoreApps
-    second:
-      enabled: 0
-      settings:
-        CPU: AnyCPU
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: 
diff --git a/src/csharp/unitypackage/unitypackage_skeleton/Plugins/System.Interactive.Async/lib/net45/System.Interactive.Async.xml.meta b/src/csharp/unitypackage/unitypackage_skeleton/Plugins/System.Interactive.Async/lib/net45/System.Interactive.Async.xml.meta
deleted file mode 100644
index 53f91502bd6..00000000000
--- a/src/csharp/unitypackage/unitypackage_skeleton/Plugins/System.Interactive.Async/lib/net45/System.Interactive.Async.xml.meta
+++ /dev/null
@@ -1,9 +0,0 @@
-fileFormatVersion: 2
-guid: 6fc38864f2d3dde46b3833c62c91a008
-timeCreated: 1531219386
-licenseType: Free
-TextScriptImporter:
-  externalObjects: {}
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: 
diff --git a/templates/src/csharp/build_unitypackage.bat.template b/templates/src/csharp/build_unitypackage.bat.template
index 07f19c2af3e..2dbb22a0d17 100755
--- a/templates/src/csharp/build_unitypackage.bat.template
+++ b/templates/src/csharp/build_unitypackage.bat.template
@@ -66,7 +66,6 @@
 
   @rem add gRPC dependencies
   @rem TODO(jtattermusch): also include XMLdoc
-  copy /Y Grpc.Core\bin\Release\net45\System.Interactive.Async.dll unitypackage\unitypackage_skeleton\Plugins\System.Interactive.Async\lib\net45\System.Interactive.Async.dll || goto :error
   copy /Y Grpc.Core\bin\Release\net45\System.Runtime.CompilerServices.Unsafe.dll unitypackage\unitypackage_skeleton\Plugins\System.Runtime.CompilerServices.Unsafe\lib\net45\System.Runtime.CompilerServices.Unsafe.dll || goto :error
   copy /Y Grpc.Core\bin\Release\net45\System.Buffers.dll unitypackage\unitypackage_skeleton\Plugins\System.Buffers\lib\net45\System.Buffers.dll || goto :error
   copy /Y Grpc.Core\bin\Release\net45\System.Memory.dll unitypackage\unitypackage_skeleton\Plugins\System.Memory\lib\net45\System.Memory.dll || goto :error