Don't sweat it, you are 20k away from needing a replacement. Once it starts stretching, and neededing frequent adjustment, you'll know it is time to replace the chain. I didn't measure my old one, but kind of wish I had, just to know what it had stretched to.
I do clean with kerosene, maybe twice a season and relube.
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Alright, the manual is killing me. I have 200 miles on my bike. How often do I need to measure the chain? I am about to lube it using the rolling back method. Can I put some kerosene on a rag and clean it. Then wait 20min, and lube it?