Never use rubbing (wood or methyl) alcohol inside a pipe because methyl alcohol is a deadly poison even in small amounts. Beverage alcohol is ethyl alcohol, whether in wine, beer, or hard liquor. And I won’t touch moonshine because of the very real danger of it containing fusil oils that can make you go blind or kill you. Use factory booze.
Vodka and Everclear are virtually the same product as far as they are distilled from “neutral grains” and are supposed to be tasteless. To get up to 95% alcohol Everclear must be distilled more than once. Vodka is grain alcohol cut with water to lower the proof.
I use Everclear 190 proof (95%) because it has more solvent action than 80 proof (40%) vodka, and alcohol dries quicker than water.
No matter which kind of booze you’ve used to clean your pipe a few days ago the alcohol is long gone by now, evaporated away. Rum might leave a little rum taste, grain alcohol in theory leaves no taste at all behind.
Most all commercial pipe sweeteners use ethyl alcohol as the main ingredient. Alcohol somehow does, temporarily sweeten pipe smoke.
My opinion of what’s causing your pipe to taste like sweet anise, is that you’ve softened the tars and resins in the airway and that goo, is ghosting your pipe with anise.
Try deep cleaning your pipe with vodka, and letting it dry a day before smoking it.
My kids are all grown up enough now to not get into my Everclear, but if there’s a kid in the house Everclear presents a danger some fool kid like I was fifty years ago might chug it and die of alcohol overdose or burn their mouth.
Of course, a kid can figure out a lot of ways to not live to comb gray hair, but most survive to adulthood anyway.