Bifold doors are generally very low maintenance. They will only need infrequent cleaning and occasionally you may need to oil the track mechanism to ensure smooth opening. Speak to your installer and ask about general housekeeping and long lasting treatments.
Dulas
Dulas or City Dulas is a town in Anglesey, in north-west Wales. It is located on the A5025 roadway, near the shore (Dulas Bay) at only 5 metres (16 ft) over sea level. The village has never ever held the status of a city and "City" is not a recognisable Welsh word, so its beginning is unclear. It might be that the name came from an Anglicisation of Saith Ty, which is Welsh for "7 Houses". There are two places in Wales just called 'City': City, Powys and City, Vale of Glamorgan.