code: func (d *DNSProvider) CleanUp(domain, token, keyAuth string) error {
  	fqdn, _ := dns01.GetRecord(domain, keyAuth)
  
  	// acquire lock and retrieve authZone
  	d.inProgressMu.Lock()
  	defer d.inProgressMu.Unlock()
  	if _, ok := d.activeRecords[fqdn]; !ok {
  		// if there is no cleanup information then just return
  		return nil
  	}
  
  	recordID := d.activeRecords[fqdn]
  	delete(d.activeRecords, fqdn)
  
  	// delete TXT record from authZone
  	return d.deleteTXTRecord(domain, recordID)
  }
docs: // CleanUp removes the TXT record matching the specified parameters.