Oil fumes are often described as smelling like “dirty socks,” or as being musty, moldy, or foul. Hydraulic fluid fumes often have a distinctive acrid odor.
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The hot and humid air produced by the airplane's engine mixes with the cool and dry air outside of the airplane, resulting in the formation of contrails. In other words, contrails are condensation in the sky that manifest as white smoke.
Opening an airplane door during a flight is incredibly difficult, and quite literally impossible. Airplane doors are designed to be opened by cabin crew only, and will only open while the airplane is on the ground. This is due to the pressure difference between the inside and outside of the airplane.
Bathroom cleanliness in-flight is handled by the flight attendant as well, who checks throughout the flight to ensure the lavatories are stocked and tidy.