What is the ruling for body hair removal for both the giver and the receiver of the treatment?

In some restaurants, for example McDonald’s, where fish is served to customers, it is not known whether the fish is of the type that has scales. In such a case, is there any problem in eating the fish or not?

Is consuming white alcohol, which is advised by physicians for heart problems, permissible?

Considering the fact that many women do not observe hijab properly, is unintentional look at them haram?