First thing, naturally, is to get the fish out, if you haven't already...I'm assuming you have.
Secondly, unplug the filter. If you've gotten any soap in it, throw the wheel/media away. If you can clean any sponges completely, then they should be ok, but I wouldn't mess with the biowheel or filter floss.
1) Drain the tank completely.
2) Remove everything and separate it.
3) Boil the rocks.
4) Spray out the tank until you can't see any bubbles.
5) Put the decorations into a colendar/sifter/what ever you call drainer thingee, and run a bunch of water over it.
Then, I would put everything back together, minus the fish, and run for a few days looking for soap bubbles, etc
As for the fish, you might try putting a bit of prime into his/her water, to help with the slime coat. Also, depending on what bowl it's in now, I would consider moving it to something bigger, since it'll be there for a few days.