www.makemkv.com

I've now had two copies of EPiC and get hash errors on both copies of the 4K disc. Anyone else having issues ripping it?

I washed the second isc with Dawn and dryed with a cotton ball and now it reads.

Sounds like the famous Chemical Haze Issue™ again, then.

So far I've never really needed to use soap or anything like Dawn to clean a disc, but I did come across discs with such a bad haze that they needed around 4 or so cleaning attempts with a wet microfiber cloth before they could be read.

There's a market opportunity here.
The same people who buy a very expensive mains lead (all the rods in the metal pointing in one direction) would probably buy a specialist cleaning solution to ensure that all the benefits of Dolby Vision and Dolby Atmos are fully realised. Otherwise you could be missing out on something.