Good old H20
Clean water is undoubtedly the world best drink! I am not sure if you need to wash the salt out without having lab test to check for sodium level (salt).
.But being reasonable with salt in take (no added salt to foods, minimize chips, saltyfoods etc...And keep well hydrated with h20 will be adequate.
Quick washout is actually not a good thing--could be dangerous.
Consult your doc..