I'm assuming Brownell;s blue liquid release agent.
I could be wrong,but I think its PolyVinylAlcohol. Sometime in the last century,a couple of decades before Millennials were invented,there was a Mountaineering sort of outfitter store called Holubar. Holubar had a subsidiary named Carikit.
Carikit was about sew-it-yourself coat,vest,sleeping bag,and other gear.
You can imagine the home stitcher having difficulty installing high fill Canadian goose down in all the baffles and pockets.
So Crikit packaged the down in number coded blue plastic bags.You load them as you sew.
Then the sleeping bag or coat went into the washing machine. The PVA bags melted and dissolved away,releasing the down.
So...my point is,have you tried a toothbrush and water? Maybe with some Bon Ami?
See if it works.
If you have it,the Brownells release works good. So often,its dried up.
Johnson's paste wax has been reliable for me.
Be careful about anything that remains oily. Some improvise release agents can inhibit the curing of the resin. Maybe silicone .
It comes to mind that maybe hairspay works,but don't take my word for it. Do a test before you risk a bedding job.