Due to the salt air environment we live in it is advisable to clean windows and doors every three months making sure that the drainage slots are kept unblocked and free from dirt, spiders webs and so on. This will allow any water that appears in the frame to drain away and prevent leaks.
You will also need to lubricate the moving parts ,hinges ,latches etc to keep the windows
and doors operating properly ideally every six months, minimum once a year using a general light engineering oil with corrosion inhibitors such as 3 – in – one multi purpose oil. ( available in aerosol can for convenience)
Do not use solvent based aerosol sprays such as WD 40.
These contain chemicals that attack parts of the windows and doors which can result in
weakening/ breaking parts and may stop them working