Majestic Star chips when they were released last year were the smelliest chips I have ever received. When I opened the box from USPS Oh My! They stunk like a Spittoon.
Fortunately the ultrasonic cleaned them up. 1 minute per barrel (to minimize wear on old leaded chips) 15 seconds,shake,15sec, tooth brush to each side to loosen more dirt, then back in for another 20-30 seconds out and rinse. 42 celcius, dish soap and coarse salt. The smell is completely gone.
The new batch is grimey but not nearly as smelly as last year (perhaps they aired out for a year, either way no pics yet but these chips are seeing a night and day improvement after the ultrasonic. Here is a side by side before/after of some chips on the towel in a composite of each shot.
In short I recommend an ultrasonic