Thanks, Tudor, I was hoping it would be you responding. I did see your post on draining a loader for reference.
So, the X585 shares implement hydraulics with the drive train/transaxle. Is the transaxle reservoir the one you are referring to? If yes, when I've checked the oil is is always clear and as I mentioned, when I removed the blower, all drippings at the connections were clear although (I do understand water sinks in oil). When the loader is stored, I leave the hoses laid up over the cross member of the loader see pic below. Connectors are circled in white. I can still proceed with your recommended process if appropriate.