diff --git a/pc/peer_connection_simulcast_unittest.cc b/pc/peer_connection_simulcast_unittest.cc
index f975d370c7..acd1da1d0a 100644
--- a/pc/peer_connection_simulcast_unittest.cc
+++ b/pc/peer_connection_simulcast_unittest.cc
@@ -1167,6 +1167,10 @@ TEST_F(PeerConnectionSimulcastWithMediaFlowTests,
   EXPECT_THAT(GetCurrentCodecMimeType(report, *outbound_rtps[0]),
               StrCaseEq("video/VP8"));
   EXPECT_THAT(*outbound_rtps[0]->scalability_mode, StrEq("L1T1"));
+
+  // Cleanup that may be needed due to webrtc:15018.
+  RTC_LOG(LS_INFO) << "Closing local PC.";
+  local_pc_wrapper->pc()->Close();
 }
 
 TEST_F(PeerConnectionSimulcastWithMediaFlowTests,
@@ -1208,6 +1212,10 @@ TEST_F(PeerConnectionSimulcastWithMediaFlowTests,
   EXPECT_THAT(*outbound_rtps[0]->scalability_mode, StrEq("L1T3"));
   EXPECT_THAT(*outbound_rtps[1]->scalability_mode, StrEq("L1T3"));
   EXPECT_THAT(*outbound_rtps[2]->scalability_mode, StrEq("L1T3"));
+
+  // Cleanup that may be needed due to webrtc:15018.
+  RTC_LOG(LS_INFO) << "Closing local PC.";
+  local_pc_wrapper->pc()->Close();
 }
 
 TEST_F(PeerConnectionSimulcastWithMediaFlowTests,
@@ -1256,6 +1264,10 @@ TEST_F(PeerConnectionSimulcastWithMediaFlowTests,
   parameters = sender->GetParameters();
   ASSERT_EQ(parameters.encodings.size(), 1u);
   EXPECT_THAT(parameters.encodings[0].scalability_mode, Eq(absl::nullopt));
+
+  // Cleanup that may be needed due to webrtc:15018.
+  RTC_LOG(LS_INFO) << "Closing local PC.";
+  local_pc_wrapper->pc()->Close();
 }
 
 TEST_F(PeerConnectionSimulcastWithMediaFlowTests,
@@ -1313,6 +1325,10 @@ TEST_F(PeerConnectionSimulcastWithMediaFlowTests,
   EXPECT_THAT(GetCurrentCodecMimeType(report, *outbound_rtps[0]),
               StrCaseEq("video/VP8"));
   EXPECT_THAT(*outbound_rtps[0]->scalability_mode, StrEq("L1T2"));
+
+  // Cleanup that may be needed due to webrtc:15018.
+  RTC_LOG(LS_INFO) << "Closing local PC.";
+  local_pc_wrapper->pc()->Close();
 }
 
 #if defined(WEBRTC_USE_H264)
@@ -1356,6 +1372,10 @@ TEST_F(PeerConnectionSimulcastWithMediaFlowTests,
   EXPECT_THAT(*outbound_rtps[0]->scalability_mode, StrEq("L1T3"));
   EXPECT_THAT(*outbound_rtps[1]->scalability_mode, StrEq("L1T3"));
   EXPECT_THAT(*outbound_rtps[2]->scalability_mode, StrEq("L1T3"));
+
+  // Cleanup that may be needed due to webrtc:15018.
+  RTC_LOG(LS_INFO) << "Closing local PC.";
+  local_pc_wrapper->pc()->Close();
 }
 
 #endif  // defined(WEBRTC_USE_H264)
@@ -1405,6 +1425,10 @@ TEST_F(PeerConnectionSimulcastWithMediaFlowTests,
   EXPECT_FALSE(encodings[0].scalability_mode.has_value());
   EXPECT_FALSE(encodings[1].scalability_mode.has_value());
   EXPECT_FALSE(encodings[2].scalability_mode.has_value());
+
+  // Cleanup that may be needed due to webrtc:15018.
+  RTC_LOG(LS_INFO) << "Closing local PC.";
+  local_pc_wrapper->pc()->Close();
 }
 
 // The spec-compliant way to configure SVC for a single stream. The expected
@@ -1455,6 +1479,10 @@ TEST_F(PeerConnectionSimulcastWithMediaFlowTests,
   ASSERT_EQ(parameters.encodings.size(), 1u);
   EXPECT_THAT(parameters.encodings[0].scalability_mode,
               Optional(std::string("L3T3_KEY")));
+
+  // Cleanup that may be needed due to webrtc:15018.
+  RTC_LOG(LS_INFO) << "Closing local PC.";
+  local_pc_wrapper->pc()->Close();
 }
 
 // The {active,inactive,inactive} case is technically simulcast but since we
@@ -1507,6 +1535,10 @@ TEST_F(PeerConnectionSimulcastWithMediaFlowTests,
               Optional(std::string("L3T3_KEY")));
   EXPECT_FALSE(parameters.encodings[1].scalability_mode.has_value());
   EXPECT_FALSE(parameters.encodings[2].scalability_mode.has_value());
+
+  // Cleanup that may be needed due to webrtc:15018.
+  RTC_LOG(LS_INFO) << "Closing local PC.";
+  local_pc_wrapper->pc()->Close();
 }
 
 TEST_F(PeerConnectionSimulcastWithMediaFlowTests,
@@ -1571,6 +1603,10 @@ TEST_F(PeerConnectionSimulcastWithMediaFlowTests,
   EXPECT_THAT(*outbound_rtps[0]->scalability_mode, StrEq("L1T3"));
   EXPECT_THAT(*outbound_rtps[1]->scalability_mode, StrEq("L1T3"));
   EXPECT_THAT(*outbound_rtps[2]->scalability_mode, StrEq("L1T3"));
+
+  // Cleanup that may be needed due to webrtc:15018.
+  RTC_LOG(LS_INFO) << "Closing local PC.";
+  local_pc_wrapper->pc()->Close();
 }
 
 // Exercise common path where `scalability_mode` is not specified until after
@@ -1629,6 +1665,10 @@ TEST_F(PeerConnectionSimulcastWithMediaFlowTests,
               Optional(std::string("L2T2_KEY")));
   EXPECT_FALSE(parameters.encodings[1].scalability_mode.has_value());
   EXPECT_FALSE(parameters.encodings[2].scalability_mode.has_value());
+
+  // Cleanup that may be needed due to webrtc:15018.
+  RTC_LOG(LS_INFO) << "Closing local PC.";
+  local_pc_wrapper->pc()->Close();
 }
 
 TEST_F(PeerConnectionSimulcastWithMediaFlowTests,
@@ -1670,6 +1710,10 @@ TEST_F(PeerConnectionSimulcastWithMediaFlowTests,
   EXPECT_EQ(*outbound_rtps[0]->bytes_sent, 0u);
   EXPECT_EQ(*outbound_rtps[1]->bytes_sent, 0u);
   EXPECT_EQ(*outbound_rtps[2]->bytes_sent, 0u);
+
+  // Cleanup that may be needed due to webrtc:15018.
+  RTC_LOG(LS_INFO) << "Closing local PC.";
+  local_pc_wrapper->pc()->Close();
 }
 
 TEST_F(PeerConnectionSimulcastWithMediaFlowTests,
@@ -1745,6 +1789,10 @@ TEST_F(PeerConnectionSimulcastWithMediaFlowTests,
   EXPECT_THAT(*outbound_rtps[0]->scalability_mode, StrEq("L1T3"));
   EXPECT_THAT(*outbound_rtps[1]->scalability_mode, StrEq("L1T3"));
   EXPECT_THAT(*outbound_rtps[2]->scalability_mode, StrEq("L1T3"));
+
+  // Cleanup that may be needed due to webrtc:15018.
+  RTC_LOG(LS_INFO) << "Closing local PC.";
+  local_pc_wrapper->pc()->Close();
 }
 
 }  // namespace webrtc