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black spots on my pavers spread to my orchid roots

I have many (large)hanging vandas with very long roots, The roots are now spreading over some spare pavers I stacked below vanda roots. I discovered that the pavers have black mold or mildew (because of heavy rains) and the roots of vandas have attached themselves to the pavers. They have grown all over the pavers and the mold. Would it be ok to spray a weak solution of diluted bleach over the pavers and roots? Would it burn the roots?
Thanks for any suggestions.

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