I have to admit that despite my profession (31 years in lubricant R&D) I'm pretty lackadaisical about chain lubrication. Most of my rides are offroad, including through the grime, mud and rain of winter. My typical regime is to hose down the whole bike (including chain) if it gets muddy, spray the chain with GT85 or WD40 to dry it, then dribble whatever oil I have to hand on it (might be a dedicated bicycle chain oil, might be a fork oil, could be a household '3-in-1' type oil, occasionally an engine oil). If the bike isn't that muddy I skip the wash-down and just go straight to oiling. I'll wipe off any excess once done. I don't do intercontinental miles on any bike so chain replacement is acceptable in terms of time.