I was ceaning my bike today and I spotted these stains. I did replace my brake fluid last week, but I don't understand how it could have gotten to here as the reservoirs are on the right side of the steer and beneath the saddle. I also do not recall spilling any brake fluid anywhere.
I'm not sure what it is, and it doesn't go of with a sponge and soap.
I honestly also don't know exactly how brake fluid biting into paint looks.
What is your guess of what this could be? And how it can be fixed?