After you have played your pipes, with the gels in the tube, and you notice that you have moisture forming on your drone reeds, you will need to remove the tubes, remove the gels from the tubes, place it in a sheet pan and place the pan in an oven set on a low heat in order to evaporate the moisture collected in the gels. This is better then using a microwave which will make the gels crack due to heating the water to quickly