Cleaning this stuff is quite easy. All you will need is a water hose and a gentle sponge or scrub of your choice. There are some products that you can use out there like the EcoClean Solutions Algae stain remover, but you don’t necesarilly need them, they will just make you job a little bit easier.
Dried algae is disturbing to look at when it dries on your outdrive over the winter. Its tend to look like electrolysis corrosion, but thankfully it is not. It’s just dried up Algae. Its important to get rid of this stuff before the boat goes in the water, because you will end up with a drive that looks like its grown a forest on it if you don’t. Its just not pleasant to look at.
What you’ll need
Start by wetting the drive until the algae loosens up and turn greenish. If you did choose to use a product go ahead and apply it at this point. Once the algae soaks up the water you can just gently rub it off using the sponge. Keep repeating the process until the algae is off.
If anyone suggests to you to use a power washer, I suggest against it because if you’re not careful you’ll end up striping the paint on the outdrive. Just take your time and get as much out as you can. Remember if you miss some of it, its not a huge deal.
Hopefully you won’t get this on your drive this season, but if you do, you should get decent results using only water and a sponge. Hope this post helps and enjoy your boating season.