I've painted lots of FW resin stuff and all I do is chuck it all in a bowl of very warm water and a cheap washing-up liquid and leave it to soak for 3 hours. After soaking, I give it a quick rinse in clean water. I've not had a single problem with them at all after that.
If you do that and are still having issues, try using an old toothbrush to scrub it while rinsing it off.
What sort of primer are you using? I've used Tamiya and GW with success.
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