Here are some links re this topic
http://www.theage.com.au/victoria/toxic-timebomb-homes-relet-after-drug-labs-busted-20100731-110q7.html
https://www.deq.state.ok.us/lpdnew/MethLabs/meth.htm
http://methlabcleanup.com.au/about/
Seems that the main thing is to dispose of any material that...