If you use any cleaner with pumice you can write off the decals and most of the paint. It will destroy them.
I've run out of Hoppe's and am still not finished cleaning this little thing. The remaining gunk looks like the inside of an oven with all the baked on grease. But I don't want to ruin what's left of the paint and decals so I'm only going to use non abrasive cleaners.
And so far, the following is all that's worked:
Hoppe's #9 Gun Cleaning Solvent.
And these have not:
Simple Green
Dawn dish washing detergent
Lighter fluid
Sewing machine oil
I think I'll try some paint thinner on the edges that's giving me the worst trouble.
Joe