Copy it to any non-NTFS filesystem.
Alternate Data Streams (ADS) are a feature unique to NTFS. It is similar to, but distinct from, extended attributes (xattrs) on many Linux filesystems like ext4. The primary difference is that ADS streams may be hidden, requiring knowledge of the ADS handle to access it, whereas xattrs can be enumerated.
Because only NTFS supports ADS, copying it to a filesystem like ext4 effectively cleans it out. It is for the same reason that xattrs are not preserved when a file is copied from ext4 to NTFS.
On a side-note, while malicious code could theoretically hide in a file's ADS, it would not be active there. Malware stored in an ADS would be completely neutralized until something else intentionally activated it. It is no more a source of infections than other places data can be hidden.