Is it permissible to use 70% ethyl alcohol as a disinfectant before washing hands with water and soap?

The impurity of alcohol, which is Khamr (wine/intoxicant), is a matter of differing opinions. The questioner considers it impure, while some scholars, like Sheikh Ibn Uthaymeen, deem it pure. A layperson may follow the opinion of someone they trust.

If alcohol is pure, then there is no issue in using it as a disinfectant. However, if it is impure, then there is a difference of opinion and elaboration regarding its use as a disinfectant.