I personally never empty my Presto pot. When it gets low, I just add more wax to keep it at least 1/3 full all the time. I have heated, poured, left it sit for weeks on end with the lid on to keep out the dust, reheated, and poured again. I have never noticed any quality loss or problems with the wax. If I were to use more than one type of wax, I would want to have a separate Presto pot for the other wax so I would not have to be concerned about waxes getting mixed together between cleanings. I have not found it necessary to completely empty or clean mine at all over the past six or eight months. I have experienced no problems so far at all.