My wife put some potted plants on the front porch and then watered them. They left circular ring stains on the concrete.
The porch is 1 year old finely floated cement that apperently was not sealed. The plants were only their about a week. Some of the rings were removed by pressurized water and a scrub brush but 2 of them from clay pots are much more stubborn. They want to stay put.
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