30 second
I did my neighbors sidewalk with a product called 30 seconds. After a few attempts and a few bottles, I found:
1) Change 30 seconds to 30 minutes
2)Forget hooking it up to a hose. I replaced the hose cap with a sprayer. Spray on full strength, wait thirty minutes, then use the hose to rinse off.
3) Do it two times and the result is very nice. I imagine it can take three times, depending on how long since it was last done.
The sidewalks (white) had turned black where ever a lawn sprinkler hit it. I told her ahead of time that I was going to do mine, and if she was willing to take the chance on me screwing up her sidewalk, I would do hers at the same time.
Life can be very difficult, if you can help someone make it a bit easier, go for it.
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