On Monday, October 23, 2017 at 9:42:45 AM UTC-4, N_Cook wrote:

2 minutes in an ultrasonic bath ,canted over to the yellow side, in
methylated spirits. Both now fine photo-grade output, with refilled carts.

Yes. Ultrasonic cleaners can be very close to magic if properly applied.

Peter Wieck
Melrose Park, PA