it was a little hard for me not to get even if a little bit dirty on this one so i found this while researching...
"The wheel wells are almost non-existent, as the wheels were not fully retractable.
Of note is large amount of petrol stains apparent around the vents on the wing's underside. This was a common occurrence on P-35 aircraft in service, as the wing was constructed as "wet", forming a large fuel tank by itself and thus giving this innovative fighter an extra range. However, the pioneering technique was a bit ahead of it's time - many of the P-35s developed fuel leaks, causing a lot of trouble to ground crews..."
and i had this picture in the site to see the defect
(museum airplane)
nice i thinked to myself...so i put my hands working and i got this
it was the best i could do, the rest its gonna stay like it is clean as a virgin ...