"... If anyone has any information, or suggestions as to where to look in Wisconsin ..."
Since your 2009 posting, the US Federal Govt. census records are now found online up through 1940. Many libraries offer online access for free, but there are other sites that offer some or all of those records online from the comfort of home.
There's a local resource that's lousy with Milwaukee Schneider entries or references -- about 2000+ -- called "Milwaukee's German Newspapers; an index of death notices and related items" (1844-1950).email@example.com
, originator/compiler/editor, Milwaukee Wis.
Indexing Milwaukee's German newspapers continuously since 2007... collecting evidence contemporary with historic German-American families.