diff --git a/cmd/gomobile/build.go b/cmd/gomobile/build.go
index 9584ea5..a1e308b 100644
--- a/cmd/gomobile/build.go
+++ b/cmd/gomobile/build.go
@@ -253,6 +253,8 @@ func init() {
 
 	addBuildFlags(cmdBind)
 	addBuildFlagsNVXWork(cmdBind)
+
+	addBuildFlagsNVXWork(cmdClean)
 }
 
 func goBuild(src string, env []string, args ...string) error {
diff --git a/cmd/gomobile/clean.go b/cmd/gomobile/clean.go
new file mode 100644
index 0000000..1c0e348
--- /dev/null
+++ b/cmd/gomobile/clean.go
@@ -0,0 +1,32 @@
+// Copyright 2015 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	"fmt"
+	"path/filepath"
+)
+
+var cmdClean = &command{
+	run:   runClean,
+	Name:  "clean",
+	Usage: "",
+	Short: "remove object files and cached gomobile files",
+	Long: `
+Clean removes object files and cached NDK files downloaded by gomobile init
+`,
+}
+
+func runClean(cmd *command) (err error) {
+	gopaths := filepath.SplitList(goEnv("GOPATH"))
+	if len(gopaths) == 0 {
+		return fmt.Errorf("GOPATH is not set")
+	}
+	gomobilepath = filepath.Join(gopaths[0], "pkg/gomobile")
+	if buildX {
+		fmt.Fprintln(xout, "GOMOBILE="+gomobilepath)
+	}
+	return removeAll(gomobilepath)
+}
diff --git a/cmd/gomobile/init.go b/cmd/gomobile/init.go
index ef52e19..94fa759 100644
--- a/cmd/gomobile/init.go
+++ b/cmd/gomobile/init.go
@@ -566,7 +566,7 @@ func fetch(url string) (dst string, err error) {
 	}
 	hash := hex.EncodeToString(hashw.Sum(nil))
 	if fetchHashes[name] != hash {
-		return "", fmt.Errorf("sha256 for %q: %v, want %v", name, hash, fetchHashes[name])
+		return "", fmt.Errorf("sha256 for %q: %v, want %v. Try 'gomobile clean'", name, hash, fetchHashes[name])
 	}
 	if err = os.Rename(f.Name(), dst); err != nil {
 		return "", err
diff --git a/cmd/gomobile/main.go b/cmd/gomobile/main.go
index b17d93d..4e0e184 100644
--- a/cmd/gomobile/main.go
+++ b/cmd/gomobile/main.go
@@ -174,6 +174,7 @@ var commands = []*command{
 	// TODO(crawshaw): cmdRun
 	cmdBind,
 	cmdBuild,
+	cmdClean,
 	cmdInit,
 	cmdInstall,
 	cmdVersion,