I have no idea if there are long term consequences to using this but I’ve been experimenting with Method floor cleaner for the last three months and I’ve been happy. The ratio to water is about 1:10 so it is quite diluted but still leaves the floors feeling nice, smells good, and so far the robot has had no issues with slipping or docking. The solution sprays evenly and doesn’t foam up which was a concern.

I got my m6 for a good price used so I’m less concerned about using non-approved solutions.