diff --git a/tests/decisions-neg-delta/Makefile b/tests/decisions-neg-delta/Makefile
index 0bd001e7c5..6bfe09f5ea 100644
--- a/tests/decisions-neg-delta/Makefile
+++ b/tests/decisions-neg-delta/Makefile
@@ -22,4 +22,4 @@ json: coverage.json
 clean:
 	rm -f testcase
 	rm -f *.gc*
-	rm -f coverage*.*
+	rm -f coverage*.* summary_coverage.json
diff --git a/tests/decisions/Makefile b/tests/decisions/Makefile
index 174890a117..75955d0d12 100644
--- a/tests/decisions/Makefile
+++ b/tests/decisions/Makefile
@@ -22,4 +22,4 @@ json: coverage.json
 clean:
 	rm -f testcase
 	rm -f *.gc*
-	rm -f coverage*.*
+	rm -f coverage*.* summary_coverage.json
diff --git a/tests/filter-relative-lib-from-unfiltered-tracefile/Makefile b/tests/filter-relative-lib-from-unfiltered-tracefile/Makefile
index bfb416a776..85ea6f1b75 100644
--- a/tests/filter-relative-lib-from-unfiltered-tracefile/Makefile
+++ b/tests/filter-relative-lib-from-unfiltered-tracefile/Makefile
@@ -57,4 +57,4 @@ else
 		cmd.exe /C "rmdir /S /Q project\relevant-library";\
 	fi
 endif
-	rm -f coverage*.* sonarqube.xml jacoco.xml
+	rm -f coverage*.* cobertura.xml sonarqube.xml jacoco.xml
diff --git a/tests/nested/Makefile b/tests/nested/Makefile
index 018f1e309d..a5596a48d2 100644
--- a/tests/nested/Makefile
+++ b/tests/nested/Makefile
@@ -45,4 +45,4 @@ clean:
 	rm -f ./subdir/testcase
 	rm -f *.gc* */*.gc* */*/*.gc* */*/*/*.gc* */*/*/*/*.gc*
 	rm -f *.o */*.o */*/*.o */*/*/*.o */*/*/*/*.o
-	rm -f coverage*.* cobertura*.* sonarqube*.* jacoco*.* coveralls.json
+	rm -f clover.xml coverage*.* cobertura*.* sonarqube*.* jacoco*.* coveralls.json
diff --git a/tests/no-markers/Makefile b/tests/no-markers/Makefile
index 9c08ec75ec..3f874a6e14 100644
--- a/tests/no-markers/Makefile
+++ b/tests/no-markers/Makefile
@@ -37,7 +37,7 @@ json:
 clean:
 	rm -f testcase
 	rm -f *.gc*
-	rm -f coverage.txt coverage*.html cobertura.xml sonarqube.xml jacoco.xml coverage.json coverage.lcov
+	rm -f coverage.txt coverage.css coverage*.html cobertura.xml sonarqube.xml jacoco.xml *coverage.json coverage.lcov
 
 # mark ALL targets as phony (because they are)
 .PHONY: %
diff --git a/tests/simple1/Makefile b/tests/simple1/Makefile
index 9ac5968d03..26837bb011 100644
--- a/tests/simple1/Makefile
+++ b/tests/simple1/Makefile
@@ -73,4 +73,4 @@ clean:
 	rm -f testcase
 	rm -f fail_under.stderr
 	rm -f *.gc*
-	rm -f coverage.txt jacoco.xml coverage*.html coverage*.css cobertura.xml sonarqube.xml coverage.json summary_coverage.json coveralls.json
+	rm -f coverage.txt jacoco.xml clover.xml coverage*.html coverage*.css cobertura.xml sonarqube.xml coverage.json summary_coverage.json coveralls.json
diff --git a/tests/source_from_pipe/Makefile b/tests/source_from_pipe/Makefile
index b6bf73a05e..5056edb458 100644
--- a/tests/source_from_pipe/Makefile
+++ b/tests/source_from_pipe/Makefile
@@ -32,5 +32,5 @@ jacoco: coverage.json
 	$(GCOVR) -a $< --jacoco -o jacoco.xml
 
 clean:
-	rm -rf build
+	rm -rf *.gcd* *.o
 	rm -f testcase coverage*.* cobertura*.* sonarqube*.* jacoco*.* coveralls.json
diff --git a/tests/symlink-root/Makefile b/tests/symlink-root/Makefile
index 2da1406892..9489b00ceb 100644
--- a/tests/symlink-root/Makefile
+++ b/tests/symlink-root/Makefile
@@ -30,4 +30,4 @@ else
 		cmd.exe /C "rmdir /S /Q symlink";\
 	fi
 endif
-	rm -f root/*.gc* coverage*.*
+	rm -f root/*.gc* root/testcase coverage*.*
diff --git a/tests/wrong-casing/Makefile b/tests/wrong-casing/Makefile
index 7d6567ffae..a1c465a57f 100644
--- a/tests/wrong-casing/Makefile
+++ b/tests/wrong-casing/Makefile
@@ -10,5 +10,5 @@ json:
 	$(GCOVR) --verbose --gcov-keep --gcov-use-existing-files --json-pretty --json coverage.json main.case_1.gcov data
 
 clean:
-	rm -f *.gcov
-	rm -f coveralls.json
+	rm -f data/*.gcov
+	rm -f coverage.json