diff --git a/.travis.yml b/.travis.yml
index 1ffb66f3..1a325614 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -81,6 +81,7 @@ script:
     local project_path="$1"
     local sail_cmake_path="$2"
     local build_type="$3"
+    local old_dir="$PWD"
 
     echo
     echo "External Windows Test '$project_path' '$build_type'"
@@ -94,6 +95,8 @@ script:
 
     fail_on_error cmake -A x64 -DSAIL_DEV=ON -DCMAKE_PREFIX_PATH="$sail_cmake_path" ..
     fail_on_error cmake --build . --config $build_type
+
+    cd "$old_dir"
   }
 
   test_external_unix()
@@ -101,6 +104,7 @@ script:
     local project_path="$1"
     local build_type="$2"
     local exe="$3"
+    local old_dir="$PWD"
 
     echo
     echo "External Unix Test '$project_path' '$build_type'"
@@ -115,6 +119,8 @@ script:
     fail_on_error cmake -DSAIL_DEV=ON -DCMAKE_BUILD_TYPE="$build_type" ..
     fail_on_error cmake --build . --verbose
     fail_on_error "$exe"
+
+    cd "$old_dir"
   }
 
   build()
@@ -146,6 +152,8 @@ script:
 
         test_external_windows "tests/external/link/c"   "$CMAKE_INSTALL_PREFIX/lib/cmake" "$CMAKE_BUILD_TYPE"
         test_external_windows "tests/external/link/c++" "$CMAKE_INSTALL_PREFIX/lib/cmake" "$CMAKE_BUILD_TYPE"
+
+        rm -rf "$CMAKE_INSTALL_PREFIX"
       ;;
       osx | linux)
         CMAKE_INSTALL_PREFIX="/usr/local"
@@ -161,11 +169,14 @@ script:
 
         cd tests
         fail_on_error ctest --verbose
+        cd -
 
         fail_on_error "$CMAKE_INSTALL_PREFIX/bin/sail" --version
 
         test_external_unix "tests/external/link/c"   "$CMAKE_BUILD_TYPE" "./external-c-api-link"
         test_external_unix "tests/external/link/c++" "$CMAKE_BUILD_TYPE" "./external-c++-api-link"
+
+        xargs rm -v < install_manifest.txt
       ;;
     esac
   }