My Aya 28ga chambers have some heavy fowling, about where the hull opens in the chamber, I have run my bronze brush through it and used a heavy duty solvent/ plastic remover, but it won't come out.

Is this something I should get a chamber brush for? Something I can pull back and fourth through the chambers soaked in solvent? Theres one at brownels Im looking at, could I possibly just use one extension of my rod I already have with my hopped phos bronze brush and just pull it back and fourth to clear it out?

Thanks!

I wrap 4-0000 steel wool around a bronze brush, wet it with solvent and insert into my electric drill and spin it through. That should do no harm but it will polish out everything...Geo

Dowel rod with 0000 Steel Wool, light oil, drill motor, and common sense will take care of your fouling.

George beat me !

Yes, that also works for all the shotgun gauges. Some plastic hulls tend to leave surface rust in chambers, don't know why, but it happens.

I have used shooters choice for years- give it a good soaking and hit it with a brush repeat a couple time then run a bore snake through, rule of thumb 5 passes for every 15 shots.
If you can get your hands on some. (What I used in the service,was PD-60 or 680 eats plastic like no tomorrow)

Big 45 Frontier Pads have worked better for me than anything else. Wrap some around a brush and chuck it up in your electric drill and introduce some solvent then spin away. I expect your fouling won't stand up to this treatment.