How to clean a headstone without killing the plants growing around it?

The headstones of some of my family are covered with moss maybe? I don't know what it is, but it's covering the words on the stones, and I'd like to clean them. However, there are plants growing around most of the stones, and I don't want chemicals to kill them. Would I just use a mild soap and a... show more The headstones of some of my family are covered with moss maybe? I don't know what it is, but it's covering the words on the stones, and I'd like to clean them.
However, there are plants growing around most of the stones, and I don't want chemicals to kill them.
Would I just use a mild soap and a scrub brush?
Thanks for any help!
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