grails (un)install-plugin not cleaning up properly

It could be just me, but some plugins for grails don't work so well. For one of my grails projects, I had maven-publisher installed. When I saw that the release plugin is to replace maven-publisher plugin in the future, I thought I'd try it out. For the record, I had maven-publisher 0.8.1 installed. So, I did:

grails uninstall-plugin maven-publisher

grails install-plugin release

All seemed ok. It installed release plugin 1.0.0.RC3. There I tried this:

grails maven-install

It gave me this NPE bug:

java.lang.NullPointerException: Cannot get property 'file' on null object

Thankfully this bug was already logged and a patch attached too. See http://jira.grails.org/browse/GPRELEASE-23 for more details. Anyway, I decided to go back to the old maven-publisher for now. So I did:

grails uninstall-plugin release

grails install-plugin maven-publisher

Now, I was trying to maven-install again, and I get this error:

[...]
Dependencies resolved in 2207ms.
Running script /home/tlee/.grails/1.3.7/projects/myhumbleproject/plugins/maven-publisher-0.8.1/scripts/MavenInstall.groovy
Error executing script MavenInstall: No such property: releasePluginDir for class: MavenInstall
groovy.lang.MissingPropertyException: No such property: releasePluginDir for class: MavenInstall
	at MavenInstall.run(MavenInstall:17)
	at MavenInstall$run.call(Unknown Source)
	at gant.Gant.prepareTargets(Gant.groovy:606)
Error executing script MavenInstall: No such property: releasePluginDir for class: MavenInstall

I tried this:

grails clean

grails war

It asked if I wanted to uninstall svn-1.0.0.M1 which was installed by release plugin before. I said yes, and grails war script continues and builds the war file. I run:

grails maven-install

and I again get the same error as before. I tried removing entire $HOME/.ivy2/cache folder, and I still got the same error. And then, I tried removing entire $HOME/.grails/1.3.7/projects/myhumbleproject/ folder. Then:

grails maven-install

resulted in grails asking me back for clarification.

Running pre-compiled script
Script 'MavenInstall' not found, did you mean:

1) UninstallPlugin

2) InstallPlugin

3) InstallDependency

4) InstallTemplates

5) Init
Please make a selection or enter Q to quit: Q

Ha! Ok. I ran:

grails war

Then:

grails maven-install

Finally, it worked! It seems a compiled script remains even after uninstalling the release plugin.