Get ready for the spring commissioning of your boat by  following these simple tips to de-winterize it after a long, hard  winter. If you did winterize your boat, you saved yourself some spring  boat prep time and possible headaches now, which means the road between  your boat and the water is shorter! Although it is always best to  winterize a boat before putting it into storage, if you didn't, don't  worry.  You can perform those tasks now for the spring commissioning.  Here's how: 
1. Have Your Manufacturer's Manual Handy
If  you have a copy, great. If you don't, it would be a good idea to get  one. You'll need it to replace fluids and parts properly. Never take  apart anything without consulting the manual first. 
2. De-winterizing Your Engine
The engine  is the heart of the boat, and since it will most like take the greatest  amount of time and be the messiest, start here. If you didn't change the  oil at the end of last season, do so now. After running your boat all  summer, it's likely that water, acids and other byproducts have built  up. It's important to change the oil to prevent corrosion and excessive  wear which can lead to loss of power, poor fuel economy or engine  failure. At the same time you change the oil, be sure to change the oil  filter. Change the oil in transmission or the outboard's lower unit as  well.
Next, flush the cooling system and replace the antifreeze with a 50/50 ratio of water to coolant.
Finally, replace the batteries and perform a thorough engine test.3. Inspect the Canvas & Vinyl
Check  your bimini top, seats, covers, and other vinyl and canvas items for  tears, mildew and dirt. Repairs tears and holes, and then clean with the  proper cleaner for canvas and vinyl.4. Inspect the Hull
Carefully  inspect the hull for blisters or other chips and cracks as well as for  chalky residue. If you find blisters, repair them. If the boat's hull is  chalky, it could indicate oxidation. Determine the level of oxidation,  and then 
restore the boat's gelcoat to its original luster. Then, throughout the summer, follow the 
gelcoat maintenance plan to keep oxidation at bay.
5. Clean and Wax the Hull
First  clean your boat's exterior using a marine safe cleaner from a marine  supply store. Then, apply a fresh coat of wax according to the  instructions in the 
gelcoat maintenance plan.
6. Inspect the Windshield Wipers
Inspect  and replace windshield wipers if necessary. If the wipers are in good  condition, apply a rubber lubricant to protect them from the harsh  marine environment. Some experts recommend stowing wipers until you need  them to keep them in good condition longer.7. Polish the Metal and Teak
Known  as brightwork, metal and teak enhance the look of your boat. If it's  dull, your boat will not have the same visual appeal as it might  otherwise have. Also, prolonged neglect of metal and teak can result in  pitting and eventually compromise the integrity of the materials and  their intended use. To protect the metal, use metal polisher like Never  Dull. For teak, it is usually recommended that you sand it and then  apply stain and varnish.8. Replace and Test all Electronics
Bring  all the electronics back on board and do a thorough test to be sure  they are working properly. Test the radio, GPS, compass, depth finder,  and any other marine electronics. 
9. Clean the Interior
Whether you have an open deck or cabin with full galley, clean the area thoroughly to remove dirt and debris.