Not your Granddad's choke tubes....Browning 725 tubes that are advertised to reduce blow back....Somewhere between 1500 and 2000 rounds....oil for the lubricant. May have been rem oil or even motor oil, can't remember which.
How they came out....
A quick wipe with a paper towel pretty much took care of 90%+
However the insides had a good bit of build up that needed brushed out.