The answer is detangling rinse. Milady lists it directly, alongside two other examples: detangling rinses, basic conditioners, and finishing rinses are examples of instant conditioners.
Instant conditioners, per the book, coat the cuticle scales rather than penetrating the hair shaft, adding oils, moisture, and sometimes protein without deep processing. Permanent wave products and blowdrying sprays serve entirely different functions in the same chemistry chapter, and a dandruff rinse is a scalp-treatment product, not a conditioning category.
Milady Standard Barbering, 6th ed., Ch. 7 (Basics of Chemistry), p. 194: "Detangling rinses, basic conditioners, and finishing rinses are examples of instant conditioners."
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