Github user 1ambda commented on the issue:
https://github.com/apache/zeppelin/pull/1824
@Leemoonsoo Thanks for review!
Now `mvn clean` will execute `npm run clean` (8baaea2)
```
$ zeppelin-web git:(ZEPPELIN-1850/remove-grunt-clean) mvn clean
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option
MaxPermSize=1024m; support was removed in8.0
[INFO] Scanning for projects...
[INFO]
[INFO]
------------------------------------------------------------------------
[INFO] Building Zeppelin: web Application 0.7.0-SNAPSHOT
[INFO]
------------------------------------------------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.6.1:clean (default-clean) @ zeppelin-web ---
[INFO] Deleting
/Users/lambda/github/apache-zeppelin/zeppelin-master/zeppelin-web/target
[INFO]
[INFO] --- frontend-maven-plugin:1.3:npm (npm clean) @ zeppelin-web ---
[INFO] Running 'npm run clean' in
/Users/lambda/github/apache-zeppelin/zeppelin-master/zeppelin-web
[INFO]
[INFO] > zeppelin-web@0.0.0 clean
/Users/lambda/github/apache-zeppelin/zeppelin-master/zeppelin-web
[INFO] > rimraf dist && rimraf .tmp
```
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