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I use 3 in 1 spray oil for the multipoint locking mechanism.
If it's gritty, it could be building debris, or quite often flakes of pvc from when the frame was routed. Remove the locking mechanism and give it a good brush off with a paintbrush and flush it with a load of spray.
Handles, 2 or 3 screws, pull off the handles and spindle.
Cylinder, remove the screw inline with the cylinder and turn the key to 11 o'clock or 1 o'clock to align the cam so that you can withdraw it from the gearbox
Draw a datum line across the strip and door edge, so you get it back in the same place.
Watch out for the screws that hold the centre and hook gearboxes onto the strip, many are torq, but some are pozi head machine screws. Other gearboxes are swaged into place.Remove the screws that hold the strip to the door.
Pull the strip and gearboxes out of the frame. Sometimes they are quite tight, but check for missed screws before going mad.
Use a handle and spindle to work the mechanism and give it a thorough clean.
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user69121
Polygon
My UPVC front door mechanism is really stiff, just the mechanism as it's the same when it's open. It's never been great ad we had the stone done outside which threw up a lot of dust so it's even worse now. Reading some conflicting opinions about the correct type of lube to use, some say silicone, some say graphite, there's obviously a lot of dust in there already. Is there any way to clean it first without replacing, and any [more] opinions on what to lubricate it with once it's clean?