I use Gibson fret conditionner oil and a small toothbrush then clean out the excess oil with a clean cloth. I've never used the others on the pack tho.

http://www.musiciansfriend.com/product/Gibson-Luthiers-Choice-3Pack-Cleaner?sku=420163&src=3SOSWXXH

I was able to restore the freatboard of my SG by using this. The previous owner didn't take care of it and it was in pretty bad shape, very dry and crackling. With time, the fretboard gradually absorded the oil to where now it is all good.