Mike Williams' company Anpure is one of just a handful contracted by Housing New Zealand to take on the messy work of methamphetamine decontamination.
"There's a lot of demand for what we do however there's not many people who can do it properly," Williams says.
"It's something that we really specialise in and we're passionate about. Unfortunately, because there is so much demand, every man and his dog is picking up a hammer and saying they can decontaminate a house and the results prove otherwise."
In an attempt to stop the cowboys, the Government, in June, issued a voluntary standard for those who test and carry out the decontamination.
But Williams says not everyone will follow those guidelines, including some landlords.