Ah, always better to ask than to screw the pooch, so they say :lol:
First, there are two issues here--the alcohol type, and the salt-and-alcohol treatment.
As mentioned above, use Everclear or other 90%+ spirit to really clean your pipes. Remember that proof is the % of alcohol doubled--e.g., 90% alcohol/volume spirit is 180 proof. I use Polish rectified spirits of 96% alcohol, or 192 proof. As Fred says, it's anhydrous and will draw moisture out of your bowl and leave no residue. Rubbing alcohol = BAD; there are sulphuric and phosphoric compounds left over from the manufacturing process that do not agree with living things.
EXERCISE DUE CAUTION WITH ALCOHOL. Around your pipes, that is. It can easily strip finish off of the outside of the pipe, as well as the paint in nomenclature (the stampings), and can spot-oxidize a vulcanite stem. It can also flash explosively if the fumes come in contact with burning embers from a matchhead or a dottle. Or if you're playing around with the empty bottle and decide to investigate what happens when you throw lit matches at it. It can also lead to being drunk, but that's for another thread.
The salt-and-alcohol treatment, or a cotton ball if you prefer, is periodic maintenance for your pipe--something you only really need to do occasionally, say every few months to a year depending on how much you smoke and how gunky your tobacco leaves your pipes. It is also a common method for exorcising ghosts from the pipe--'ghosts' being residual odors from past smokes that have become unwelcome, haunting spirits. The process is thus:
Remove the stem from your pipe. Using NON-iodised salt, or a cotton ball, pack it into your chamber. Insert a nice fluffy pipe cleaner in the shank, perhaps capping the end with a cotton swab. Saturate the salt or cotton with your cleaning agent. Walk away for a couple days. Come back, clean it out, repeat if necessary.
The combined process of the alcohol acting as a solvent, evaporation, and capillary action will pull tars and moisture out of your briar. Note that I said BRIAR--this treatment is NOT for meerschaums, corncobs, or brylon. (hehe, brylon).
Or you can use an alcohol retort, and have a clean and uncaked bowl in a few minutes rather than days. But that gets a little more complicated. And you can pretty much kiss your eyebrows goodbye.
For regular maintenance, Everclear or your pipe sweetener are fine. Sounds like you already have that down pat.