Dennis sound like a load of B.S. to me, literally. Mushroom soil should be the composted material like they sell in bags. It will have a lot of organics in it but should be close to neutral pH (7.2-7.6). If it is killing the lawn and staining the pavement then there is a lot of tannic acid from the wood products and ureic acid from the BS.
I would let is compost a while. You may use it straight but be careful what plants get it, i.e. must be acid loving. Adding a little soil to the heap will help seed bacteria and increase the rate.
Power pressure washing should remove the stain. Other wise you may need to acid wash the concrete.
Peters - trying to cut through the B.S.

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