UndeclarePlusMinusOne

UndeclarePlusMinusOne[x]
removes x from list of symbolic representations of +1 or -1.
UndeclarePlusMinusOne[x, y, ...]
removes x, y, ... from list of symbolic representations of +1 or -1.
Remove one symbol from list of symbolic representations of +1 or -1:
Remove many symbols from list of symbolic representations of +1 or -1: