Your bi-fold doors and windows contain mechanical moving parts that will need to be lubricated periodically. These include hinges, multipoint lock, handles and nylon trolley wheels in the top and bottom track. Lubricate using silicone spray or grease and wipe away any excess with a non-abrasive cloth once you have finished.
To clean the aluminium profile you can give them a wipe down with a damp cloth and a light soapy solution.
Over time the tracks will collect dust and debris, especially during the building process*. Using a small brush, loosen any debris that may be stuck in the track cavity. Then, with a thin nozzle attachment on a vacuum cleaner you can easily remove the debris in the track.
*If installing the bi-fold doors must be installed before all heavy/messy work is complete, we recommend refraining from using the bi-fold doors as access. If they must be used, open wide and cover the tracks with a thick dust sheet/wooden boards. No claims of scratches and scuffs will be accepted after acceptance of delivery, so be sure you cover yourself and ensure your contractors are careful on site.