Distinguish deposits from surface damage
Mineral residue may appear where water repeatedly dries, while scratches, coating wear or etching can look similar. Marks on ceilings, timber or around frames may indicate a leak rather than hard-water deposits. Do not assume one cause from appearance alone.
Check glass and coating instructions
Tinted, coated, treated, heritage and shower glass can have specific care limits. Read the maker's guidance and test only as directed. Avoid metal blades, abrasive pads or pressure washers unless the exact glass maker permits them.
Use a compatible labelled cleaner
For routine compatible glass, use a product labelled for that surface, apply it to a cloth if instructed and wipe with a clean lint-free material. Do not mix vinegar, baking soda, bleach, ammonia or other products, and keep liquid away from frames, seals and electrical components.
Stop if marks persist
Permanent etching, damaged coating and water-ingress problems may not be removable by cleaning. Ask the glass maker or a qualified window professional before trying acids, polishing compounds or stronger chemicals.
