i made some taper candles from last years wax and the stuff i took from a cut out. some of the wax was quite dirty, but i melted it in water and strained it. after that, i melted it again in water with a little lemon juice in it. i let it cool on the water then removed the cool block and washed it. it was not perfectly clean, but fine for my purposes.
study wicks and molds before you spend the money. make sure you get the right wicks for beeswax candles and the right molds for what you want. mold release helps, but also removing candles before they are cold. i got some old metal taper molds and played with them a bit. the candles slid right out without a problem if i removed them before they were cold.
lindas solar wax melter looks great. don't know if i get enough sun, but i already have what i need to make it so i'll give it a go.