Aspergillus resistance to sanitizing agents

[Robert Domine]

Can anyone recommend an effective sanitizing agent for ridding our 
pharmaceutical manufacturing facility of A. flavus and A. 
fumigatus?  It must be non-corrosive to stainless steel and 
feasable for large scale application (spray, mop, fumigation).
We have tried several actives with only moderate success.  It 
appears that we have a particularly resistant (and prolific) 
strain contaminating our plant environment.

Thanks