If the brake/clutch fluid has done this much damage to the closing plate there is likely lots of similar damage to the frame in the same are. Use a mirror or my personal favorite an inspection camera to check for more bubbled epoxy in that corner and use POR15 or Eastwood Internal Frame paint. Also check
the area of the frame on the left front tire side, some of the fluid could have dribbled out. Use a dremel tool with cutting wheel to get down to the frame prior to using any product.