This is what I know;
1- Ethyl alcohol, which may be as wipes, the one's most common in day to day use or in liquid form, "do effect BG Readings" and may give faulty results, but, could be used afterwards to clean your fingers.
2- 70% V/V Isopropyl Alcohol Gluco Swap Wipes are used to clean your fingers before the BG Measurement and only those alcohol one's do not give faulty results. They are also in liquid form and can be used with a piece of cotton. The same wipe or cotton piece can be perfectly used to clean the blood drop and the finger following the measurement.
Ideally, and practicality, the hands are washed with a plain and pure soap. And, these are used when washing is not possible.
In hospitals they use both type of alcohol for different purposes.
70% Isopropyl Alcohol wipes and bottled ones may be available from some drugstores but, sold at Diabetes Supply Stores, on line or the actual store itself.
70% Isopropyl Alcohol is also used for the weekly cleaning of the lancet device and how this is done is simple but, a little bit of tricky and there is normally a manual which comes with the lancet device explaining this.
Cleaning the lancets in between uses with hospital surgical sprit is something which I have not heard of it before and am not able to comment on it but, what I have heard is, a tiny drop of blood is viable to create problems once it gets in contact with air. It is like the traffic. Millions drive each day but, accidents only happen to some.