Hmm - easiest would be to call a boatyard and write them a cheque when they bring it back all redone.
Cheapest would be to buy some industrial strength boat soap and go at her with some scrub brushes. If the cracks are hairline stress cracks you proabably don't need to worry too much about them.
If they are larger and deeper then it's probably a good idea to seal them with some epoxy before you get everything all wet.
If you do a search in this forum you'll find a lot of personal favorite products listed that other people like to use.
Good Luck !
