Hi - I wanted to share that I just used vitamin c pills from CVS to succesfully remove rust stains from my pebble sheen plaster in spa. The rust was from some fertilizer with iron that ended up going over spa wall when I fertilized the lawn. I let the pill sit for 30 seconds and then rubbed it in followed by brushing with small stiff nylon brush. Repeated 2 times and looks great now.
Glenn
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