This weekend I tried to spot clean the area with 303 cleaner and had good results. No discoloration resulted from the cleaner and I got about 85% of the stain (water leak from garage roof) removed. I'm pretty sure a second application of 303 will get the residual stain.
I used a soft bristle toothbrush and flooded the area with clean water 3 to 4 times after completing the scrubbing with 303 Cleaner.
YMMV.
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