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Dang that's had a few round through it!!!

Try tapping it on a solid surface and knocking it lose? Will take a few wash to get rid of that mess. Maybe soak over in a snaplock bag (or container...

Make sure you take it off the rifle when in storage as well, corrodes the inside of your barrel and if over barrel the carbon builds up to horrible levels!

If you go to the dpt website I think they have informal available for cleaning their suppressors. Wash it out in the sink with detergent and hot water, find a pipe cleaner to get down inside it....