Fill a jug or bottle of hot water from the tap (NOT boiling from kettle) and slowly pour over the front face of the cylinder. Allow a couple of minutes for the heat to un-freeze the lock, and then spray our L4V lubricant or GT85 into the cylinder to disperse any water.
During adverse weather conditions or high usage, it may be necessary to increase the maintenance frequency. An indication that lubrication is required is when key operation, including insertion into the cylinder becomes stiffer or more difficult than usual. We advise you only use a PTFE based lubricant on L4V cylinders, which could be our own L4V Lubricant or GT85.