That is disappointing that the company could not answer a simple question, and that they did not return your call.
As Chachi wrote, there have been threads on YT by people urging others not to use Minksheen because of the mink oil and animal cruelty.
This article explains the sodium hydroxide used to produce soap/various toiletries:
A Closer Look at Sodium Hydroxide | Personal Care Truth or Scare
There is an argument to be made that soap is too harsh and not ideal for health. I read skincare forums and there are people who never use soap on their faces. They wash only with water or various solutions of olive oil, oatmeal, and other natural ingredients. The also use sodium chloride and sulfate free shampoos.
Relative to the flea and tick preventatives -- My understanding is that the chemicals are absorbed into the body and that is how they work, so it is safe to wash after about 24 hours. In other words, the preventative is not working outside our pets' bodies, topically. Is this correct?