how do you clean the line on the top front of the iphone where you use the iphone if it has dirt in it?

see the section in

https://support.apple.com/en-gb/HT203794

"If necessary, clean the speaker or receiver opening with a small, soft-bristled brush. Make sure the brush is clean and dry."

Wipe it with a soft cloth. Apple even sells one although it's kind of pricey.

Polishing Cloth - Apple

Try a clean dry toothbrush

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Sorry, I was talking to y-p-w

Read my post above that one.

bmurray1 wrote:

????

The message was edited completely out. Have no idea what was said, but I believe it was directed at me.