I'm going to complain about my building's janitors to HR.
Did the janitors do something wrong?
No, I want more assistance from them.
Complaining to HR about something minor that a coworker did might be a bit of an overreaction. It would be better to talk to the janitors and explain the issue you are having. Going to HR could result in a lot of trouble or even being fired for the janitors.
It's fine. I'm going to tell HR that the janitor is racist.
You already said that the janitors didn't do anything wrong, so don't try to make up lies about them to get them in trouble. If you want more help from the janitors, just ask them. If you're caught making up lies about people to HR, you may be fired.