Blue stains on screen

To determine the damages and cost to repair the screen (liquid/chemical

you may need to return to the Apple store or official authorized reseller.

• Apple - Find Locations - Location Selector

https://locate.apple.com/findlocations

• Genius Bar Reservation and Apple Support Options - Apple

https://www.apple.com/retail/geniusbar/

[see 'hardware - link' button for repair]

• Apple Repair and Repair Status Check - Official Apple Support

https://support.apple.com/repair

A determining factor would chemicals & liquids contained in 'Wet Tissues.'

• How to clean your Apple products - Apple Support (portable/screen)

https://support.apple.com/en-us/HT204172#portables

Apply sparsely, any spray or liquid carefully, to the clean microfiber cloth;

so nothing actually wet gets into portable mac; a little can be too much.

"To clean the Screen on your MacBook, MacBook Pro, or MacBook Air, first

shut down the computer and unplug the power adapter. Dampen a soft,

lint-free cloth with water only, then use it to clean the computer's screen."

"To clean hard-to-remove smudges, you can moisten the cloth with a 70-

percent isopropyl alcohol (IPA) solution."

A few mac-centric product resellers have non-destructive screen cleaners.

..an Example from one; may be useful on quality displays & high-cost optics..

• Photodon® Ultra Screen and Lens Cleaner

(reseller specializes in various display protectors, cleaners, & related products)

[Use 'microfiber cloth' slightly damp with water. If is dust present, don't rub it in.

Washable 'quality' microfiber cloths, should be carefully laundered before reuse]

My recommendation still is genius service inspection & official opinion/options.

Hi,

Yet another staingate issue?

You'd better cleaning MacBook Pro screen with cleaning cloth which comes with MacBook Pro, though you should contact Apple Support and ask about it.

https://support.apple.com