A one-time bath using a sensitive skin or gentle wash designed for people likely won't harm your cat, but it may still be a good idea to check any specific ingredients in it for toxicity. You can find lists of toxic plants/substances on sites such as here:
https://www.aspca.org/pet-care/animal-poison-controlSigns of toxicity to look out for may include minor symptoms such as drooling, foaming at the mouth, seizure, disorientation, dilation of pupils, vomiting or diarrhea. If you do see any signs that may indicate a possible toxicity or find an ingredient that is toxic to your pets in it, it is best to contact your local veterinarian for treatment.