On 5/30/2018 5:32 PM, John Keiser wrote:
On 5/29/2018 4:47 PM, John Keiser wrote:
I have a Grohe shower unit installed by a previous owner.
I want to inspect so I can get a replacement cartridge.

[snip]

John Keiser

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Patience + CLR worked.
I usually am not very patient but it was necessary for this.
I added a bit of white grease on reassembly so next time might not be
such a problem.

Try some Lock-tite or Permatex anti-seize compound/lubricant. Great
staying power in wet conditions, prevents corrosion, etc.

A little dab will do you - just don't use it on your hair!