To strip ACLs from all files in the current working directory, run this:

chmod -R -N .

You might want to do this kind of thing if you’ve restored files from a Time Machine backup by hand, preserving permissions. By default Time Machine backup files have this ACL for everyone:

deny write,delete,append,writeattr,writeextattr,chown

Don’t change your Time Machine volume, just use this to strip the ACLs of files you copied from it.