Originally Posted by dishwasher
the inside of our dishwasher to turn brown.
A starting point
http://www.google.com/search?hl=en&client=safari&rls=en&as_q=dishwasher+brown&as_epq=&as_oq=residue+film&as_eq=&num=10&lr=&as_filetype=&ft=i&as_sitesearch=&as_qdr=all&as_rights=&as_occt=any&cr=&as_nlo=&as_nhi=&safe=offSome of these 430,000 hits must be relevant.
Also, see what your neighbors and your water company says.