What did you use on the seat tube Hat in Ring panel decal? That's an amazing difference!
I was kind of nervous about them because I had messed some of those decals up in the past.
I ended up taking some water, dish soap and a car wash mitt. I very gently washed over the decal and barely increased the pressure until I could see the yellowing come off.
The key is to not get carried away and stop while you're ahead.
