For a correct maintenance of my lines, just follow a few simple rules.
During the fishing season, apply a small quantity of the supplied dressing (included in the packet) every 4/5 outings to keep them soft and supple.
In DT lines, apply the dressing after having turned the line around following the same rules. This will keep the line dressing uniform.
To increase the life of the line, I suggest you let it dry out after every outing. Do not use any kind of detergent, linseed oil nor let it dry near a heat source.
AT the end of the season dress the line, wind it up in spires and place it back in its box.