Keep the right documents.
Retain the opening schedule, order reference, manufacturer care guidance and written warranty. Identify the system and finish before selecting cleaning products or attempting any adjustment.
Document the condition at handover. Photos and opening numbers make it easier to describe a later concern and identify the relevant assembly.
Clean with the finish in mind.
Follow the manufacturer’s cleaning guidance. Avoid abrasive tools or unapproved solvents, and keep construction residue away from the frame and glass. Ask for advice if you are unsure how a coating should be cleaned.
Keep accessible tracks and drainage paths free of loose debris without altering the drainage components. Do not seal over openings or remove parts simply because they appear unused.
Report difficult operation.
If a sash rubs, a handle becomes difficult to turn or water appears where it should not, record the symptoms and contact the supplier. Do not force the mechanism or make unsupported hardware changes.
Send the order reference, opening number, photos and a short video if useful. See service and handover information for the details to include.