Used rags are supposed to be stored under water so they don't catch fire--the stuff doesn't so much dry as react, and if there's inadequate air circulation the result can be very bad. So I dumped rags in the (enclosed and freestanding) firepit on the "who cares" plan. So far no flames. Next time I'll try wadding it up.
While looking up details, I found that poor King Tut seems to have had a little run-in with the stuff--his mummy wrapping were apparently soaked in it but not allowed to dry. I'm not sure if the researchers got a positive ID on the oil in this particular case, but apparently it was one of the standard treatments. I should try their little experiment. I'll let a tight ball of soggy rags stand in for a mummy.