Is there a pH range for "neutral" detergents?
Neutral detergents are not neccesarily at pH 7, and I know of no legal restriction (at least in the EU) on labelling detergents as neutral based on pH. For example, this patent claims protection for a set of neutral detergent formulae with pH of "from about 5.5 to about 8.5".

An example of a commercial product is Proctor and Gamble's "Tide", which has a pH of 8.1-8.5 according to their safety data. This is advertised as "100%" neutral !