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Banty Banty is offline
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Default Black foundation

In article , Tony Sivori says...

Ray K wrote:

Can anyone identify the problem on some of the cinder blocks at the base
of the outside wall of my garage? I'm wondering what the black stuff is.
It doesn't rub off, and it's unaffected by bleach. Photos appear on
alt.test at time 5:49 pm, 3/17/08.

Looks like grease or tar. Perhaps a previous owner did some engine work

Can't see the photos, but is part of the foundation buried? Is the garage part
of your house rather than a separate structure? Could it maybe be the tarring
to waterproof the buried part?