How to clean project cache in Intellij idea like Eclipse's clean?

Question

Sometimes the IDE makes some error because of the cache. In Eclipse, we can use clean to solve the problem. But how can I do this in IntelliJ?

Answer 1

In addition to the .Intellij* files, and invalidating the cache, if you really want to clear everything out, then also delete the .idea folder and *.iml per-project files that IntelliJ also generates...