Harts UltraGuard pro question..

I used hartz ultra guard on my car earlier today (Around 10:30am, it’s not 12 hours later) and he;s fine, but i’m going to be letting him visit two other cats this evening, i’ve washed the area down with gentle soap, but i am scared they may get sick if they lick him where he can’t. should i be concerned about this? i’m not 100% sure on their medical conditions, but they are older cats, i think one may have a dietary issue (like diabetic or something similar).
just told my friend who’s cats we’d be seeing about the flea/hartz issue, and i found out one of her cats is highly sensitive to fleas and loses fur, and her boyfriend also gets rashes from them.

what should i do??

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