diff --git a/src/bsys.c b/src/bsys.c
index b0f4ba79..f7671bb2 100644
--- a/src/bsys.c
+++ b/src/bsys.c
@@ -264,3 +264,11 @@ int bsys_sh(bsys_t const* bsys, int argc, char* argv[]) {
 int bsys_install(bsys_t const* bsys) {
 	return install(bsys, false);
 }
+
+int bsys_clean(bsys_t const* bsys) {
+	if (bsys->clean == NULL) {
+		return 0;
+	}
+
+	return bsys->clean();
+}
diff --git a/src/bsys.h b/src/bsys.h
index 2121fd0e..47b73d9d 100644
--- a/src/bsys.h
+++ b/src/bsys.h
@@ -19,6 +19,7 @@ struct bsys_t {
 	int (*build_deps)(dep_node_t* tree);
 	int (*build)(void);
 	int (*install)(void);
+	int (*clean)(void);
 	int (*run)(int argc, char* argv[]);
 	void (*destroy)(void);
 };
@@ -49,3 +50,4 @@ int bsys_build(bsys_t const* bsys);
 int bsys_run(bsys_t const* bsys, int argc, char* argv[]);
 int bsys_sh(bsys_t const* bsys, int argc, char* argv[]);
 int bsys_install(bsys_t const* bsys);
+int bsys_clean(bsys_t const* bsys);
diff --git a/src/bsys/bob/main.c b/src/bsys/bob/main.c
index 588f19a2..1051ee2c 100644
--- a/src/bsys/bob/main.c
+++ b/src/bsys/bob/main.c
@@ -280,6 +280,20 @@ static int build(void) {
 	return run_build_steps();
 }
 
+static int clean(void) {
+	char* STR_CLEANUP err = NULL;
+
+	LOG_INFO("Will remove \"%s\". ^C to cancel now.", abs_out_path);
+	getchar();
+
+	if (rm(abs_out_path, &err) < 0) {
+		LOG_FATAL("Failed to clean output directory (\"%s\"): %s", abs_out_path, err);
+		return -1;
+	}
+
+	return 0;
+}
+
 static int run(int argc, char* argv[]) {
 	// Find run vector.
 
@@ -367,6 +381,7 @@ bsys_t const BSYS_BOB = {
 	.build_deps = deps_build,
 	.build = build,
 	.install = install_all,
+	.clean = clean,
 	.run = run,
 	.destroy = destroy,
 };
diff --git a/src/main.c b/src/main.c
index 2031c92f..5720be2d 100644
--- a/src/main.c
+++ b/src/main.c
@@ -62,7 +62,7 @@ void usage(void) {
 		"usage: %1$s [-j jobs] [-p install_prefix] [-D] [-O] [-C project_directory] [-o out_directory] build\n"
 		"       %1$s [-j jobs] [-p install_prefix] [-D] [-O] [-C project_directory] [-o out_directory] run [args ...]\n"
 		"       %1$s [-j jobs] [-p install_prefix] [-D] [-O] [-C project_directory] [-o out_directory] sh [args ...]\n"
-		"       %1$s [-j jobs] [-p install_prefix] [-D] [-O] [-C project_directory] [-o out_directory] " "install\n",
+		"       %1$s [-j jobs] [-p install_prefix] [-D] [-O] [-C project_directory] [-o out_directory] install\n" "       %1$s [-j jobs] [-p install_prefix] [-D] [-O] [-C project_directory] [-o out_directory] clean\n",
 		progname
 	);
 
@@ -323,6 +323,12 @@ int main(int argc, char* argv[]) {
 		}
 	}
 
+	else if (strcmp(instr, "clean") == 0) {
+		if (bsys_clean(bsys) == 0) {
+			rv = EXIT_SUCCESS;
+		}
+	}
+
 	// This is intentionally undocumented, as it's really only used for communication between Bob parent processes and their Bob children processes.
 
 	else if (strcmp(instr, "dep-tree") == 0) {