I find a liberal application of Scholl Fresh Step normally does the job when they’ve got really stinky : Scholl Fresh Step Shoe Spray, 150ml https://www.amazon.co.uk/dp/B00BG69ACG/ref=cm_sw_r_cp_api_fabc_gfA6Fb2Y7ZF8M
You need to dry them quicker in future, 1.5 days is way too long and gives bacteria time to breed, hence the smell. Ideally use overshoes to avoid getting them so wet in the first place. Take the inner soles out to speed up the drying process and ideally get them somewhere really warm like an airing cupboard or laundry room. Or if you don’t have anywhere suitable then a shoe drier as suggested above is a good idea. I think the newspaper trick only really helps if the shoes are somewhere warm enough to dry the newspaper out quickly so that it wicks the moisture out of the shoe. And/or change the newspaper regularly. If it’s not warm enough to dry the newspaper out quickly then you just have soggy newspaper sitting in the shoe and probably making things worse not better.