If you want to simply soak the salmon in something before cooking it then you can soak the salmon in a mixture of salt and water.
Take one spoon of salt per one cup of cold water and put it in something large enough to soak the salmon in.
You then soak the salmon in the salt water solution for 10 minutes.
If you want to marinate the salmon before cooking the best solution to marinate the salmon in is a solution of olive oil, honey, lemon juice, soy sauce, lemon zest and other herbs and garlic.
To get the best results you should marinate Salmon for up to 1 hour in the refrigerator.
Salmon should be marinated for a minimum of 30 minutes but marinating the salmon for an hour makes the salmon much better.
But any longer than an hour of marinating the salmon can become mushy and fall apart.
You should never leave Salmon or any other fish marinating overnight because if you marinate the salmon or other fish overnight the salmon or fish can become mushy and fall apart.
Salmon should be marinated for no longer than 1 hour while in the refrigerator.
When marinating salmon or other fish it takes between 30 minutes to an hour for the salmon to finish marinating which is long enough.
If you leave the salmon or any other fish marinating longer than an hour the fish or other salmon can begin to get mushy.
Then as the salmon or other fish becomes mushy it then begins to fall apart.
I made the mistake of marinating salmon overnight before and it ruined the salmon.
I then found out that I should not marinate it longer than 1 hour and after finding that out the salmon has turned out just fine when marinating it.