Any good tips for dealing with smelly trainers?

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DS1 is 9yo and this summer has started to need more attention to personal hygiene iyswim, which has been dealt with as far as he personally is concerned.

However, his trainers are another matter. They're leather Clarks ones, which I thought should be OK, but honestly the smell. It's not even feet they smell of, more like DH armpits when he's done a long day on a building site mid-summer . If the trainers have been left in the hall, the smell hits you as you open the front door. I've put them through the washing machine, which helped a bit for a day or two and I've tried schol shoe freshening spray which didn't help at all. Are the trainers finshed?

FWIW, his feet are not actually that smelly, at least not in other shoes. Is there anything I can do?

Kim and Aggie tell us to put them in the freezer
Might be worth a try if you are thinking of replacing them because I don't know what sort of damage might be caused by freezing them.

Thanks Jenroy. That would mean putting them near food!!!! I'll wrap them well in plastic and see if I'm brave enough

with smelly trainers in the past what I've done is

1. loosen the laces & pull the tongue up through the space at the front

2. soak in a disinfectant solution in a bucket for a few hours

3. scrub the inside with detergent using a nail brush (or a toothbrush to get down to the toes)

4)wash in the machine with some dark clothes (eg jeans & sweatshirts)

5. dry on the line (hang up by the tongue so the air/sun can get inside as much as poss)

or alternatively chuck them & buy a new pair!

as his feet aren't smelly & the trainers are leather it may be the lining material that's doing it - they seem to use a nasty cheap kind of nylon j-cloth material IME

Cut a tight at the knee, fill it with cat litter, tie it and leave it in the shoe or runner overnight. The reason why they smell is from washing them in the machine or hand washing. It damages the glue in the footwear. Would you put your own shoes in the wash?

I use an old toothbrush dipped in hot white vinegar and brush all over the inside then leave to dry in the sun (or on a radiator in the winter). It is effective.

I'd buy a new pair and machine wash them regularly in biological liquid.

Roscrea, I only put them in wash as a desperate measure - it wasn't the machine that caused the smell, they've never been through it before.

Thanks for all the tips. I will try as many as it takes