Deutsch > Englisch Rechts- und Patentwesen Recht: Verträge Assembly Contract

This is from a contract to assemble a system:

"Tägliches Säubern der Anlage und im Umkreis der Anlage (bei Fremdverschulden auf Regie) in Absprache mit Bauleitung."

I've never seen "auf Regie" and am unsure whether it means "as directed" or "charged on a time and material basis." and I'm frankly unsure of what "Fremdverschulden" has to do with it. My guess is "charged on a time and material basis if a third party is responsible for getting the system dirty." But that is a very wild guess, so...I would love some clarification if anyone can help.

Thanks!