I always use rubbing alcohol for my pipes - where I currently live there is this blueish colored medicinal alcohol called "spirt", about 186 proof (98%). I use it because I have the feeling that any kind of liquor leaves a taste behind - such as whiskey or brandy; while this one does not. AS far as health is concerned, I did not have any issue, but I did however dry all the treated parts very well before smoking. Also, I don't clean my pipes with alcohol after every smoke. I usually do so when pulling the pipes apart for major cleaning. I do run a cleaner in each pipe after each smoke, and leave it there until I use it again - it sucks all moisture in. That is usually enough, keeping it clean to the point where I use alcohol maybe once every few months. Oh, by the way - never use alcohol on corn cobs, personally I destroyed a cob like this.