A nice overview of the Gillette Adjustable razors,
When you get a new vintage adjustable razor, it will need some major clean up work. The above video is excellent to show you how to do it. As far as sanitizing the razor I believe you could omit the dishwasher and the alcohol steps. Scrubbing Bubbles has a very effective disinfectant* in it that is sufficient to do the job. But doing the extra steps outlined in the video will not hurt and if it makes you feel more comfortable about using a second hand razor then by all means do those steps.
Chris "CAP" Smith who did this video and is the master at Gillette Adjustable razor repair (and others too.) Are you mechanically minded? Do you have the tools to do the job? He has made special jigs to do the job right - are you going to make a jig just to repair one razor? For me I would rather wait to have the master do the job for me at a certain expense. But, here is the video. Have at your own repairs if you are so inclined. Chris "CAP" Murphy's email link is located above if you want a professional repair.
"CAP" has taken the time to do a disassembly video of a rare Chrome Toggle. In order to do a proper cleaning and replating restoration a full disassembly is required. Attempt at your own risk!
* More Information About Scrubbing Bubbles:
From the S. C. Johnson website: "When used as directed [Scrubbing Bubbles], kills 99.9% of viruses and bacteria, including Staphylococcus aureus (Staph), Salmonella enterica (Salmonella), Escherichia coli 0157:H7 (E.coli), Streptococcus pyogenes (Strep), Listeria monocytogenes, Pseudomonas aeruginosa (Pseudomonas), Enterobacter aerogenes, Methicillin Resistant Staphylococcus aureus (MRSA) and^ Herpes Simplex Virus Type 1, Herpes Simplex Virus Type 2, Influenza A (H1N1) Virus, Respiratory Syncytial Virus, and Rotavirus."
Directions for use: "TO DISINFECT AND DEODORIZE HARD, NONPOROUS SURFACES:Pre-clean heavily soiled areas. Spray 6-8 inches from hard nonporous surfaces until thoroughly wet. Let stand for 5 minutes. Then wipe."
However if you are into organics and such, just be aware: "Despite its cheery cartoon scrub brush mascot, Scrubbing Bubbles bathroom and shower cleaners should do anything but bring a smile to your eco-loving face. These products contain chemicals banned in the European Union including DEGBE, which can irritate and inflame the lungs. The European Union bans this chemical in household cleaners in concentrations above 3 percent. These products contain up to 10 percent."