Most canned sauerkraut comes in brine (usually salt and water), so you don't have to rinse it before you strain it. Not rinsing it helps preserve the flavor
If there is still residual stains, first use turpentine and then wipe it off with petrol. Remove dirt from the neck. It can be erased by volatile oil such as gasoline, and can also be washed with detergent such as "collar cleaner" and finally rinsed with water. Let's go to glue stain...