Cheaper option would be Paraffin. Put it in a spray bottle and go mad. And I mean MAD!!! You need loads of fluid in there. I had a problem along the same lines. I dropped the sump of my 1127 motor to find lumps of the starter motor cover in it. 13 bits, to be precise! There appeared to be no damage, but once the seed's been planted...full strip! The more time you spend now in getting the swarf out,the better. If, on the other hand, the motor's previously had oil in it, and not waiting for fresh oil after a rebuild, I'd personally strip and wash it all out again! I know it's expensive, and a pain in the arse, but...can you live with it?
Lots of luck!