Grails clean command

Many times I faced the situation when Grails application has been screwed and comes up with mysterious error messages. Particularly Grails can create columns in database for the fields that were removed from the domain entity long time ago, services perform logic that also was removed long tome ago, etc. In that case try to execute command:

grails clean

If its still not working properly after that the last option is to clean IntelliJ IDEA cache.