Need retwist/loc help please?

So, I need help with what products to use to retwist my husband's locs. He has established locs but he doesn't know what products his previous hairstylist have used so I'm flying blind here. I know some people use bees wax, but I know that can leave a lot of residue. So does anyone have a product they suggest? Or is it alright to mix the locking gel with the bees wax in moderation?
Need retwist/loc help please?
Need retwist/loc help please?
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