Lixiviate:

1) To wash or percolate the soluble matter from.

2) To extract a soluble constituent from (a solid mixture) by washing or percolation

Metaphorically speaking, this is pretty good. I propose:

Lixiviation: the process of washing away the soluble matter or soluble constituent from (i.e. substance, meaning, identity) of culture.

Usage: 'McDonaldization is a form of cultural lixiation.'