/diy/ - Do It Yourself

What caused this gummy bit on my sterling wheel? Isolated to the one location on the vinyl(?) center piece and hasn’t spread an inch in years but it’s always gummy and sticky. 90°F outside and it’s really gummy but is still soft and sticky at 0°F. If I had a guess it looks like a solvent got to it but I’m not sure. I’m curious if there’s a cleaner or something I can use on it to make it harden up. If not I’ll order a new center cover for the steering wheel or maybe an entire new steering wheel.