In the last year for some reason, I get strange looks when I asked for the stuff as it wasn't on the shelf in the normal spot in the Paint Dept.
They didn't know what I was even talking about.
Over the last month, I have been doing some work on a house that my daughter bought. In several recent trips and phone calls to Lowes and Home Depot, I have encountered an alarming number of their employees who don't even know what drywall or plywood is. No exaggeration, they actually have no idea what department those items are in, to direct inquiries for pricing, etc.
Based upon my recent experience when I asked in what aisle I would find spackling compound, I'd imagine that a similar query about oxalic acid would result in wasting about 30 minutes of your life. I'm sorry, but when you hire someone to work in a home improvement and building supply warehouse, they should not be ignorant about even basic things. On my last trip to Home Depot, the cashier had no clue how to run her cash register.