Just as a matter of interest but does the C404 have windscreen wipers? Even with wipers, trying to see a runway through a windscreen affected by heavy rain can give a false horizon. The result is the aircraft is much lower than the pilot thinks he is. An old trick is to wipe car windscreen rain repellent over the windscreen before departure. It has the effect of breaking up the water flooding over the windscreen, into individual drops and the result is amazing you can see where you are going more clearly.
Operating a jet transport in heavy tropical downpours characteristic of many Pacific atolls where the duty Towering CU pouring rain sits over the runway at inconvenient times, rain repellent was essential. It worked marvellously. A squirt from a bottle of Coca Cola on the windscreen was effective in cleaning rain repellent residue from the windscreen after landing.
See:
Visual illusions when landing in heavy rain