Basically a visual inspection — if I could see yellow glue I scraped it away. If I recall correctly, I used a plastic spudger for most of it and a flat head screwdriver for uncooperative spots. No chemical baths, just prepping the surface with 99% IPA.Did you accidentaly do some filming about the procedure? It looks amazing!
Could you please just explan what exactly you did?
I would like to know "how" did you clean, what are the tricky point at refilling...
I am not an expert of flyback transformers requirements.
How did you clean it? Only physical cleaning or chemical as well? How did you removed the "deeper" pieces...?
What are the main requirements what in case of a resealing need to take in consideration? Electrical isolation, air insulation, visual covering...
edit: It's worth noting, applying the RTV Silicone neatly was challenging. I think somewhat recall using the windex trick to keep it from sticking to my finger. I packed it into the top to ensure there was a solid seal.