I have purchased a hive pot wax as well as a roller wax system, however am finding that it is costing a lot more for the roller wax cartridges. I usually use a creme wax but it is impossible to clean this completely out of the cartridge to refill with another brand as the hives do not produce the same brands for pot and cartridge and I am worried about mixing different brands together as the ingredients will not be exactly the same. I have thought about buying warm wax cartridges then maybe washing them completely out as it might be possible with hot water and then refilling with a wax of my choice. Can anyone advise if they refill cartridges how they do this safely ?