Hi all, I have been using a '65 Gillette Slim Adjustable with various blades and have noticed what appears to be rust forming on the bottom of the hinged doors and against razor blades. The corrosion seems to appear within 2-3 shaves with Personna's and about 5 shaves with Derby's. When I purchased the razor, I first used Brasso (no luck), then turned to a variety of sanitation tips found online (boiling water with baking soda and aluminum foil, dish soap and boiling water, etc.). I did a final cleanup with Maas polish (by the way, check Walmart for super cheap tubes); I have since completed one soap-scum cleanup with scrubbing bubbles and water. Hopefully I haven't been to hard on the old guy; it should be noted that there are a couple of spots that seem to be less silver and more bronze in color. Is this rusting (I presume it to be rusting) normal? Any thoughts? Thanks!