Checking the bike over during the offseason and noticed something I haven't seen before. It was a brand new 2020 zx10r built up by KWS for Stock1000 and was crashed and then sold to me after the first round in Atlanta, so it had a few hundred miles with the VP MGP fuel in it. During my ownership its predominantly been run on 93 non-ethanol pump gas, apart from less than a handful of times when I had no choice but to put regular 93 ethanol. Bike has around 4000 miles now since I started racing it beginning of 2022. There's a buildup of some kind of yellow film right above the valve seats in the intake ports, tried scraping it with a pick but doesn't seem to come off. Almost looks and feels like the surface is pitted. Any ideas?