I use this on my suede desert boots https://uk.saphir.paris/products/suede-renovator
I'd also get to work with a suede brush on top of the above suggestion. You may well find that alone gets them back to what you want. And then a protective spray will help against future issues. I use liquiproof which works well.
@goodhead started
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I use this on my suede desert boots
https://uk.saphir.paris/products/suede-renovator