Just purchased a used Hiker on eBay for $10.
The knife was in really good shape, expect for heavy scale wear.
Not wanting to invest in a special polish for for my SAKs, I used what I had on hand:
1. Ultra fine sand paper
2. Meguiar's Ultimate Compound
3. Meguiar's Ultimate Polish
Worked great.
I would think just about any automotive rubbing compound and polish will work.