Slakker, Unfortunately too many people unintentionally use this method! It was obviously stated cynically.
I do agree with MarinaP, not ich, the life cycle is much longer and much less detrimental to clowns and specifically blennies. Unless your tank is not cycled or out of wack somehow.
However, I disagree on the freshwater dip especially with clowns IME. I have freshwater dipped four different fish with flukes and ich or brook (not sure but it was a clown). As long as the water is buffered properly and brought to the right temp a 4-5 min dip looks like it brings the fish to the brink of death, but an hour later each fish was actively swimming (keep in mind its not a cure just a reduces stress).
This actually saved a Royal Gramma once. (my very first attempt) It was on its side motionless on the bottom gasping so I figured I couldn't loose, dip, <1hr, happy fish, had it for three years until I moved the tank and it disappeared...
Some local experienced stores unfortunately do weekly to daily fresh water dips on high risk infected fish (i.e. tangs) to keep the profit machines healthy for sale. It doesn't cure them but it sells them!