My patchwork tote looks surprisingly better. It no longer looks like

She's still drying but I'll post photos tomorrow.
In the meantime, I have this Peyton Flap I want to dunk but it has a rather nasty spot on the bottom and I'm wondering what might give me the best outcome-- if I should pre-treat it with something? I'm worried about scrubbing because I might damage the finish and this would be a hard color to touch up (I already have to figure something out for the corners). I'm not sure what the spot it but I reckon something oily.