Beats me!
I know have two different shades of stone (obviously). Where the gazebo was is practically brand new. One of the guys recommended I use numeric acid to clean them and get them all looking like new again. He warned that it is strong stuff and you should wear a mask etc. Looks like you need to be very careful handling this stuff, but people (online) that have used it say the results were great. I'm guessing a nice gas powered pressure washer would help, not sure what my Karcher can do.
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