The following are Paul's (pcsb23 - an Administrator on SD) instructions for a salt dip. I thought these instructions would come in handy at some point for someone:
2 tablespoons per gallon water. ANY salt so long as there are no anti-clog additives. Iodised salt is safe, cooking salt is cheaper.
Mix in a clean bucket with water of the same temp or from the tank. Net fish and place into bucket. After 30 mins remove back to clean water, BUT if the fish rolls over before the 30 minutes is up then remove it straight away to clean water.
I normally give the tank a good clean through when doing this or put them into a newly setup tank, but not everyone has the tankage.
The dip can be repeated daily (even twice daily) if needed for as long as necessary (well easily 2 weeks).
It is typical to see the fish drop slime, I normally do a mini w/c an hour or so after to remove the slime if its visible.