If it's not potable, I will not use it for pipe cleaning. So no Isopropyl alcohol.
I found a new inexpensive alternative to Everclear at a local warehouse liquor store:
Mystic Mountain 42O Extractor 190-proof Grain Alcohol
It is made locally in Larkspur, CO, ostensibly for cannabis & hemp processing; it is in every-way equivalent to Everclear.
In addition to pipe cleaning, I use 190-proof grain alcohol to make liqueurs: Limoncello; a Coffee Liqueur that puts Kahúa to shame; a Chocolate Liqueur; a Ginger Liqueur; a Lavender-Vanilla Liqueur; & Anisette.
They make nice gifts for friends & family.