Hi Jennifer,
You can buy the wicks on Ebay or in any good craft store. As regards the excess wax, when this happens my jars I use a tiny screwdriver (from a xmas cracker, lol) to break it off then I put it into an oil burner, it's essentially the same as the wax tarts. To prevent them burning down the middle in future, let a pool of melted wax form before extinguishing or buy a topper for them, they're brilliant.
Best regards,
colmsmum.
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