Scrubbing bubbles is fine, avoid the one with bleach btw. Usually to clean, hot water, some dish soap and a soft toothbrush are enough.
To polish, gently, many people use MAAS. Avoid polishing gold plated razors.
I recieved a 1965 Gillette Slim adjustable today and I cleaned it the following way:
10 minute bath in scrubbing bubbles
10 minutes in boiling water
Washed it again with Dawn dish soap
10 minute soak in Barbicide solution
Polished with Maas
Quick dunk into Barbicide solution
Some mineral oil, and quick polish with cloth.
