First, I hope you tried a toilet brush?
You'd have better results, if you use something like a turkey baster to remove some water from the bowl. Then, use the same turkey baster to gently apply the acid around the top of the bowl, let it run down into the water.
Wait a minute or two, and see if you can scrape the ring off with a toilet brush, or plastic burger flipper.
Flush, to dilute, and move the chemicals down the drain. While the water is flushing, scrub with the plastic flipper, or plastic heavy duty spoon. Scrub with toilet brush.
Discard the plastic scraper.
Christopher A. Young Learn more about Jesus
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I plan to raise the water level in the bowl above the ring (glass filled w/H2O), then pour the acid in. Is this a bad idea? Seriously, no troll, I am about to do it. Its a little scary taking the top off the acid when you see white fumes come out.