The truth is that I do usually use a new blade for each customer. But at times I dont, and if that is the case what I do is stick the razor into my barbacide jar let it sit in between customers and wipe it down before use. again I like to use new blades each customer, but when you are busy sometimes it makes it easier to do it that way. And to be honest I dont think that many barbers do actually change the blade each time, I dont want to speak for them but from what i have seen it seems that they dont. And as far as straights go for being used on customers, I have been told so many different reasons why we cannot use them. Mainly that they can spread disease and such, but I think the reason they arent used is because of the maintenance involved with using them. It is sometimes easier to change a blade then it would be to strop/hone a razor in between every customer. At my shop we dont do many face shaves, we mainly use our shavettes for shaving around the ears and neckline. If I had the choice I would use a true straight razor, but my boss prefers we dont due to the suspicion of them spreading disease? I will look into that for you Walt because I am curious to see if that is a state to state law or just applies to every professional?