Any idea how to make white Superga trainers look clean(ish) again?

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Or any white canvas shoes really? Mine are looking very grey and grubby but I'm not sure if they can go in the washing machine.

They are fine to go in the washing machine . My white ones came up really well .

They are fine to go in the washing machine. Stuff them with kitchen roll while they dry to help keep the shape.

Those magic sponges?

Thanks all. Doesn't it knacker your washing machine?

Oh, and another stupid question: quick wash, long cycle, hot or cool?

Mix bicarb and lemon juice into a paste and rub all over the shoes. Leave to dry and then leave in the sun for a day or so. Brush/bash the dry residue off and you'll have lovely white trainers again

I clean the outside rubber trims with white cif liquid if that's any help...

Thanks everyone. I'll give it a go tonight.

I always wash my white Supergas, have worn them for years and buy a new pair every couple of years. I've even washed white leather Supergas several times and they look great. TIP - do not use a biological detergent OR a colour detergent - they still contain some biological enzymes - as it will make the rubber yellow and the glue discolour; get non-bio tabs (I use Sainsbo's own) and use a short wash 30 or 40 degrees, put an old light coloured bath towel in there to cushion the washing machine drum.