Grime does build up inside the tube and just cleaning it with white spirit or parafin would make a difference.
I do this fisrt until what comes out at the bottom is faily clean, then use dry film lubricant (one made by wd-40 for the actual lube.
Although the steel cable may be teflon lined but what about the inside of the outer tube? Rubbing against it would wear even teflon out.
I would stay away from product that leave oily film behind as it becomes a dirt magnet
I do this fisrt until what comes out at the bottom is faily clean, then use dry film lubricant (one made by wd-40 for the actual lube.
Although the steel cable may be teflon lined but what about the inside of the outer tube? Rubbing against it would wear even teflon out.
I would stay away from product that leave oily film behind as it becomes a dirt magnet
