When I wiped off the cleaner, I pulled off what I assume was dirt (hopefully not dye), and there were spots left behind where the cleaner had been sitting. See the pic:

I've since done another cleaning pass, but this time foaming onto the brush rather than the seat. I again pulled off what appeared to be dirt on the cloth when wiping, but the spots remained.
How should I remove the spots? Is the seat just really dirty, and I should keep cleaning until the spots fade away?
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