The answer to 'metal roof water stains' is that they are a common issue caused by a variety of factors, including poor roof installation, damaged sealants, or improper drainage. The symptoms can include unsightly discoloration, rust spots, and even leaks. To address metal roof water stains, you'll need to first identify the root cause, which may require a professional inspection.
If the stains are due to minor issues like loose fasteners or damaged sealants, you may be able to fix them yourself with some basic DIY skills. However, for more complex problems like structural damage or widespread corrosion, it's best to call in a professional roofing contractor who can properly diagnose and resolve the issue.