I use good old fashioned "Olde English" lemon oil. Bought a jug 10 years ago, and there's like 90% left because of how little a well cared for fretboard will actually drink. You should be fine going to lemon oil having used other oils in the past. I've put just about everything under the sun on my SG and it's 17 years old now, looking brand new.
As far as polish goes, Yeah just buy a jug from Guitar Center or whatever and don't look back. I got a little 3 pack of Gibson sauces a while back, it had a fretboard conditioner (lemon oil) some string cleaner or something (basically rubbing alcohol) and a polish. Still have the polish, and I still like it, the string cleaner went in the trash, if you need to "Clean your strings".. You need new strings! Just saying.. And then I've been refilling the little bottle of fretboard oil with the Olde English jug.
And while we're on the topic, I'm not sure how many of you guys are More of players than builders, but I consider myself about 98% player, 2% builder at this point. That being said, for $5 put new strings on your guitar once a month

Nothing makes a guitar come to life like a new set of strings, and our fingers really lay down some nasty acidic gnarly stuff that degrades the sound quality pretty fast. I've been playing the Ernie Ball Cobalt Hybrid Slinkies on my SG and Tele lately. They sound good and loud and bright for at least a month of daily use, but they are like $10 a pack. Anyway, I digress from my rant, it just always blows my mind how many guys are not happy with their guitar sound or whatever, and the strings look like they have been under water for a month. Cheap fix!
-Brett