The solar wax melter was a little too slow for me and ants seemed to love the idea and were getting into my wax. I found this other method that works faster and cleaner.
I found a crock pot at the local store for $10. You could probably find one at a garage sale for cheaper. Fill the bottom with an inch of water and stuff all your wax in and set the crock pot on low. Depending on the size of the crockpot and amount of wax you put in it, it may take between 3 to 5 hours to melt.
After it melts, cool it as fast as you can so the wax cracks. Remove the clean hardened wax and pour out water and debris at the bottom.
Place the wax back in the crock pot and heat again on low without water. This will give you very clean wax.