I'm looking for some suggestions cleaning up an oil/gas mix spill from
the concrete floor of my garage.

The tank on an old snow thrower leaked. I put some a dry substance on it
(can't recall the brand name) that I had purchased from Wal-Mart intended to
absorb the spill.

I have a strong gas smell in the garage and, with temps not expected to get
above the mid-20s this week, my options for aggressively rinsing the area
are a bit limited. Suggestions would be appreciated.

Thanks !