This is Mr. WhP's area to think about.

About maintenance things.  I wonder if he is cleaning OK, but I have nooo idea.
Well, he was learning on Internet. OK," Honey, what are we going to get?" Here, Mr. WhP is coming.

I read that Slick Lube Bicycle Chain Lubricant is a good one.  They have three different viscosity levels, the choice depends on conditions from dry to wet and muddy.  The products are FDA certified as non-toxic and food safe and they reportedly have no smell.  A couple of long distance riders report that it lubricates well and lasts long.  I think I'll give it a try.  By the way they sell from their own site and offer free shipping (on Amazon, shipping is half the price of the lube!)