It was pretty much try the acid, attempt a biological experiment, or contribute to the landfill. So far so good. I'll let you know if things start coming apart down the road.

I actually think it worked - not because it dissolved the straw and foxtails (which it didn't) - but because it dissolved the tiny little hooks those things use to stick to animal fur. I suppose the biological method would have worked too (wet the fabric and let nature do the same thing in a week) but I wasn't sure I could live with the residual smell.