A cargo subcommand cleans all projects under specified directory.
Get package with Cargo:
cargo install cargo-clean-recursive
To clean all projects under current directory, run this subcommand with no option:
cargo clean-recursive
If you want to clean releace build only, use --release / -r option:
cargo clean-recursive --release
Also, you can use --doc / -d option to clean docs:
cargo clean-recursive --doc
You can specify --release and --doc at the same time.