The present invention relates to a device arranged to move along a cable (1), preferably a tension cable of a suspension bridge, in order to obstruct covering of snow or ice on the cable. The device (2) comprises a compound (6) that obstructs covering of snow or ice as well as means (10) to coat the cable (1) with the compound (6). In addition, the device comprises sensors arranged to detect how large amount of the compound that is in the container. The sensors detect if the container needs to be replenished, and if so is the case, the device is arranged to automatically move to a replenishing device in order to there replenish more of the compound. The present invention also relates to a method to obstruct covering of snow or ice on a cable (1), preferably a tension cable of a suspension bridge.