Best Practices for Labeling Oil Spray Bottles?

We have our first audit coming up next month, and I'm going line by line on things that I think need a little more detail to them.  One issue I keep coming up with, and cannot seem to figure out a solution, is labeling oil bottles.  We use the bottles to spray our hoppers to transfer dough (I own a bakery) from mixer to production lines.  While I can just write on the bottles with a marker, this does not seem to last more than about a week before the marker just wipes off due to the oil.

Anyone have a solution for this?  Or should I just keep with the marker?

We use a label maker. You do need a clean surface, free of oil to make it stay. Or a tag on it. 

Tag the bottles,   there should be a place where you can put a hole through the sprayer portion they you can use a zip tie (if your plan allows) to attached a laminated card with the contents

Is your audit longer than a week? Haha JK.

You could try laminated labels and metal detectable zip ties to overcome this problem. Good luck! 

New spray bottles with oil and water resistant labels, or if the old bottles are retained use laminated cards with a durable tether (metal detectable zip tie).

After they've been around a while they get broken or scratched up enough that they start to be come a harborage themselves and need to be replaced anyway.