Here's what we did for many years with our Carver and then with the Silverton. Ours have tried this and found it worked for them as well:
1) Go to the Dollar Store, Wal-Mart, etc and pick-up about a half dozen shoebox sized plastic storage containers.
2) Go to Home Depot, Lowes, etc and pick up 4 or 5 containers of DAMP RID. Get the DAMP RID that's in containers that look like half gallon milk containers.
3) Go to the grocery store and pick-up a 5 lb bag of cheap kitty litter. Scented stuff is better but don't waste money on the expensive stuff.
4) Go to the boat.
5) Remove the lids for the plastic containers and store them somewhere on the boat.
6) Mix the kitty litter and DAMP RID 50/50 in each of the plastic boxes. It is not necessary to fill the boxes; half full of better is OK.
7) Place the boxes around the cabin area and in the bilge.
8) In the spring you will find that the DAMP RID has attracted the moisture and the kitty litter has absorbed it while keeping the boat smelling fresh.
9) Place the lids back on the boxes, secure them so you don't spill anything while you carry them off the boat.
10) Empty the contents of the boxes into the trash. Rinse the boxes out and keep for next year.