If I clean I wasn't intending to spin the dry bearings with compressed air just blow the water out. I read to use degreaser and water not a solvent to remove old grease. So just wipe out old grease and put new in? What's the reason to never use water? Thanks.
Degreased bearings are way too easy to spin up with compressed air, intended or otherwise - hence the warning.
As for the water, in the case of a hydrocarbon lube in a many nooks and crannies application, it's bad news re both Solvency and Hiding.
The water hides incredibly well in the weeniest of places.
The water is not miscible in the grease later put in, so creates a localized emulsion wherever that wee water droplet is.
That emulsion has extremely poor lubricating effect.
And that emulsified grease can migrate to other areas and ruin the grease elsewhere.
Water also precludes the immediate use of an antirust oil application to serve an anti rust agent until the fresh grease is applied - this being a high humidity area concern in particular.
So, clean out with kero or similar, drain and blow as best you can, then follow with some very high flash solvent, then drain and blow that.
Frankly, attempting to clean bearings in place in a housing is begging for trouble - mostly by the cleaner that will leak/weep/creep into other spots and be at the ready to contaminate and ruin the new grease that later gets put in.
If the bearings are OK, and are still in the housing, it is infinitely better to mechanically remove as much old grease as you can, then do a few cycles of compatible new grease in/out/in to help get as much old grease out as possible, then do the final greasing.
It's winter for you, and I can tell you want to really clean those bearings.
Remove them, and go at them that way.