Locksmith maintenance such as servicing, lubricating, tightening and tightening loose parts including hinges and locks should be done by the tenant. This includes door handles, hinges, locks and window arms.
Oil the locks every two years inside and do not paint over the locks as this can cause problems inside the locks.
Once every two years inject a special lock spray into the cylinder. Only use something specially designed for this use.
Grease pivot points.
Once a year lubricate the hinges with silicone spray, grease or oil. Replace hinge bearing if necessary.