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Yes, I am on well water. I do have a water softener but these deposits must be from excursions of hardish water. The deposits seem to be occurring where a bit of water is left standing and evaporates - like on the shower enclosure floor.
Sounds like you need to adjust your WS. Like you're running out of soft water. All depends on water hardness and how much water you use.
Fresh CLR ought to work fine. So would 100% vinegar, but it might take longer. Back it up with 0000 steel wool or a very fine synthetic substitute as acid commonly causes steel wool to rust very quickly.