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I think the protocol would generally be to disassemble the device and then clean with alcohol. Easier said than done with a phone of course.

I did this with a surface go. I managed to drive off the alcohol with a heating plate. It took a few attempts. I think I heated it to 80 C or maybe even 100 C on the last run. End result was clean, except for a small line, possibly cracked diffuser.

I ruined a Thinkpad display the same way in the past, so I went for broke.

Yeah, I've had the same issue; as far as I can tell it's not actually the LCD itself but the backlight and the diffuser that end up getting screwed up. If you're trying to save electronics, keep the isopropanol away from the screen.