Quote:
Originally Posted by champion6
Based on your description - little rust spots - I think vintageogauge's diagnosis of rust from granules of fertilizer with iron is correct.
The stain is not permanent. The spots will gradually fade away. If you want them gone now, since they are rust caused by iron, a product like CLR works great to remove them.
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I was going to try CLR but it says not to use on porous material. Snowcap takes too long and leaves a white residue. The cutting wheel is the fastest or you can try a wire brush.