Looks like etch marks. I would charge $4,000 to $5,000.00 it's a pain in the butt job. If they don't like to price let someone else stand in that shower for 2-4 days and hold up an hand machine.

Thank you
Carl Staples
Classic Marble & Stone Restoration

From: sccpartners@stoneandtilepros.simplelists.com <sccpartners@stoneandtilepros.simplelists.com> on behalf of Mike Alston <realmikealston@gmail.com>
Sent: Thursday, June 7, 2018 9:33 PM
To: sccpartners@stoneandtilepros.simplelists.com
Subject: Mineral deposits
After scratching the wall and nothing came off I believe this is mineral deposits.

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