I'm pretty new to CP soapmaking and have made four batches so far. For batch #1 I used an organic EVOO (I know, sounds extreme, but it was all I had and wanted to get started). For batches #2,3,4 I've been using a an olive oil from Costco that is 15% extra virgin. The recipe is mostly OO with a small amount of coconut and castor. Batch #2 started getting DOS after a while. Of course at first I had no idea what it was (so went on to do more batches) but with research found out. Batch #3 has a little DOS, and batch #4 is too recent to tell, plus it has specks of orange rind that might hide DOS. (FWIW, batch #1 with the EVOO has no DOS at all.) So here is my problem: I still have about 1-1/2 quarts of the Costco oil. The exp. date is Dec. 2020. It does not smell rancid although I was storing it in a garage where temps fluctuated. Probably not a smart thing to do. I've read the methods of washing the oil which I guess I can try. I'm just puzzled as to why the oil doesns't smell rancid, and if it's not rancid what could the DOS come from? For batch #2, I cut off all the DOS which left me with bars of weird shapes so I grated them and made laundry detergent. I haven't used it yet, but it occurred to me now that if there is rancidity, maybe that wasn't such a good idea. I guess I'll find out after doing a few washes and seeing if it smells. Thanks for any input.