The best thing to do is try and clean the wound out as much as you can, preferably with a wound wash or with a mild soap + water solution, rinsing with water afterwards. Cleaning it using sterile gauze is always the best way as cotton wool and things can leave fibres in the wound which your body can later create a reaction to. Try and get as much of the sand out as possible and any other debris that might have gone in there. It may also be a good idea to put a gauze pad in some hot (obviously not boiling but water that you have boiled and then left for a while) and then take it out and hold it on your toes for a while, this will help to draw debris out of the wound. Take this off once it starts to go cold, dry the area and then cover it in a plaster to stop it from becoming dirty once more and allow it to heal, maybe covering it in anti-bacterial cream first. To be honest, I'm not a fan of salt water as it can be harsh on some peoples skin and as it dries cells out a bit it can slow down healing.
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