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Not to throw shade on your HVAC techs, but I would file it under "maybe". It could get hooked up to a high vacuum pump for a couple days to dry it out, and there are ways to drain, flush and replace the oil. Whether that is worth it/important to you is a different issue. If it were mine, I...

They likely used a self piercing needle valve like the one below to tap into the line and extract the Freon safely. You can place the valve in under a minute.

Sounds like a plan! All the best, 2Pbfeet

Have you tried Gunk-Off or graffiti remover first? FWIW: Gunk-Off removed a bunch of surface crud from my MEP, and didn't appear to touch the CARC underneath. A few minutes with a paper towel took some baked on adhesive, remind of Govplanet stickers, and a bunch of non-CARC spray paint...