How to use the go clean command line

Clean removes object files from package source directories. The go command builds most objects in a temporary directory, so go clean is mainly concerned with object files left by other tools or by manual invocations of go build.

The go clean Commands and Options

Usage: 
  go clean [clean flags] [build flags] [packages]

Clean flags:
-i
The -i flag causes clean to remove the corresponding installed archive or binary (what 'go install' would create).
-n
The -n flag causes clean to print the remove commands it would execute, but not run them.
-r
The -r flag causes clean to be applied recursively to all the dependencies of the packages named by the import paths.
-x
The -x flag causes clean to print remove commands as it executes them.
-cache
The -cache flag causes clean to remove the entire go build cache.
-testcache
The -testcache flag causes clean to expire all test results in the go build cache.
-modcache
The -modcache flag causes clean to remove the entire module download cache, including unpacked source code of versioned dependencies.

If a package argument is given or the -i or -r flag is set, clean removes the following files from each of the source directories corresponding to the import paths:

_obj/
old object directory, left from Makefiles
_test/
old test directory, left from Makefiles
_testmain.go
old gotest file, left from Makefiles
test.out
old test log, left from Makefiles
build.out
old test log, left from Makefiles
*.[568ao]
object files, left from Makefiles
DIR(.exe)
from go build
DIR.test(.exe)
from go test -c
MAINFILE(.exe)
from go build MAINFILE.go
*.so
from SWIG