We started doing random on-site (us being customers) audits of our critical suppliers. Most suppliers use a GFSI scheme or something similar, so its pretty easy to know what to look for.
My question is I want to do an audit of the chemical suppliers warehouse and facility. They are not the manufacturer (they sell multiple brands of chemicals), more a storage and distribution hub (basically a middleman).
What should I look for? I want to be able go in with clear objectives. I can basically do a GMP audit of their place, but since its not really food, but chemicals (cleaning) it doesn't make sense to look for some things.
I do not think they have any third party certifications of policies/procedures. (is there even a such thing?)
Any guidance would be helpful.