I know from experience that arrowroot doesn't work very well, so I'm curious to know which ones actually do.
Thanks a lot for any help!
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Your answer of "everything except arrowroot" is spot on. You should use a corn starch slurry in all likelihood. It is less expensive and more commonly available and will not create a "slimy" consistency; corn starch is also purported to have a creamier texture.
Arrow root also may have been overcooked by your preparation as described in your comment as it has a lower temperature that it needs to reach relative to other thickeners. Keep it handy for your acidic sauces, but keep to corn starch for the dairy. A benefit of arrowroot in clear sauces is that it won't make the sauce cloudy as will corn starch; however with dairy this is not a concern.