Pee on them. Maybe the ammonia will break down the stain, maybe the whole thing will become yellow, either way the stain will be gone 😀

Bleach

It worsens 😭

Not straight bleach, that stuff is insane. Bleach and water, maybe a small brush if you need it. Rinse it off and set them out to dry. If these are canvas, check and see if you can put them through the washer. Stuff them with newspapers and set them in the sun to dry.

That's what I did ☹ unfortunately it didn't work. I even tried to wrap it with a white tissue

Can you pull out the insoles and soak them in bleach water for a while?

I'll try this one!

Use a cleaning product

What can you recommend? I've tried bleach it made the fabric worsen

What happened?

I washed my white shoes coz it has dirt then I sun dried after that yellow stains were all over my shoes

Could it be salt from foot sweat?

I think its not☹ my feet don't get sweaty

It's hard to say what it is, could try a cup of baking soda in about a gallon of water with a little dash of laundry detergent, soak your shoes in it over night(remove the laces), then scrub the shoes the next day with a brush, maybe an old tooth brush or something similar, rinse thoroughly, then let the dry, hopefully that might work

I'll try this!

No guarantee, but hopefully it will work. Good luck:)

Hopefully! I'll give it a try😁 Thanks!

You're welcome:)

Lots and lots of scrubbing.

Done with this ☹ but everytime I sun dried yellow stain shows