How to fix my damaged door?

[Rahul]

Hi there I used the PVCu solvent cleaner on my door and whilst I cleaned the whole door on this spot it started to vanish and the grey colour of the door turned fully white. I tried to cover it for now by colouring it in a black marker pen. I’ve attached a picture of the cleaner and the damage it’s done. Can anyone suggest a way to undo the damage and what was the cause because the rest of the door is basically fine. 

[dpmiller]

you've likely taken paint off a joint or blemish. Matching touch-up time.

[Rahul]

13 hours ago, dpmiller said:

you've likely taken paint off a joint or blemish. Matching touch-up time.

So what should I do to fix this. Should I look for a similar paint and paint over or is there a reversal method? 

[Ferdinand]

Can you match via eg Pantone numbers?