The Environmental Protection Agency (EPA) recommends hiring a contractor trained in meth lab waste removal to help you clean a meth house.
To make the property safe, you and the contractor will need to:
survey it and design a cleanup plan
ventilate it
schedule a plumbing inspection
remove unnecessary, visibly contaminated, and absorbent items
wash remaining items with an all-purpose household cleaner
vacuum all hard surfaces with a HEPA vacuum cleaner
encapsulate all interior surfaces with an oil-based paint, oil-based polyurethane, or epoxies