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  1. #1
    Member Honorary Professor Grime Busters, LLC's Avatar
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    Algae and mold on fiberglass boat

    This is a first for me, so I ask for your suggestions.

    Just had a customer call me who just pulled his boat our of a local lake. Been sitting for several years apparently. He states the hull has excessive algae and mildew.

    It's a fiberglass hull, so high pressure is not an option. With a solution of bleach and Dawn work on a project like this, or what would you guys suggest.

    As always, your professional advice and willingness to help is always appreciated.

  2. #2
    Member 3000 PLUS POSTER Kory's Avatar
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  3. #3
    Residential and Commercial Pressure Washing Specialist and International Word Mark Expert! Honorary Professor Mark 8262's Avatar
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    If that does not work you might try Hull Cleaner by Starbrite. That is what I use on my boat when the hull starts to get brown and it makes it bright white again. Just spray it on and wipe it off.

    Good Luck

  4. #4
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    I've used oxalic for years. Works great on Great Lakes crud. 1,200 PSI rinse.

  5. #5
    Member Associate Professor Pat Norman's Avatar
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    Quote Originally Posted by IndyExterior View Post
    I've used oxalic for years. Works great on Great Lakes crud. 1,200 PSI rinse.
    Hey Rick. I gotta clean my boat too. Do you use anything before using the ox (soap and SH?) How do you apply the OX? Downstream? how strong to mix it?
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  6. #6
    Member Professor with Tenure
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    I use a pump sprayer. Just guessing but maybe a 1/2 to 3/4 cup in a 3 gal sprayer. I tried all kinds of stuff before. I kept a boat slipped on Lake Michigan in some pretty dirty water near steel mills and it did the job. Just spayed let it dwell a few minutes rinse and repeat. Don't know if it works everywhere but it did there.

  7. #7
    Cleaning with Aloha Graduate Student ckingclean's Avatar
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    You'll probably find that there's more nastiness on there besides the mold and mildew. My boat used to get a brown buildup on it and I used Calcium Lime Rust remover to take it off (CLR). It's an acidic product so the OX would probably work too. I don't know if it's bad for the fiberglass though. Probably would be a good idea to ask a boat expert before attacking it.
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  8. #8
    Member Honorary Professor Grime Busters, LLC's Avatar
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    My local Marine supply house recommended a product called On and Off Hull cleaner

    http://www.jamestowndistributors.com...ct.do?pid=2339

    It's an acid based product that claims to be safe on fibergalss gel coats. Will give it a try tomorrow and post before/after pictures.

    Thanks guys for your suggestions and assistance.

  9. #9
    Member Honorary Professor Grime Busters, LLC's Avatar
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    Here's the before and after pictures of the project. Most of the waterline areas to 3 applications of the oxalic based hull cleaner product. Did the entire boat with just under 1 quart of the product @ $16.50 a quart. 3 hours + $355.00 plus a $100.00 tip. Wish all days went so well.

    http://s65.photobucket.com/albums/h2...view=slideshow

  10. #10
    Member Honorary Professor Grime Busters, LLC's Avatar
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    Quote Originally Posted by ckingclean View Post
    You'll probably find that there's more nastiness on there besides the mold and mildew. My boat used to get a brown buildup on it and I used Calcium Lime Rust remover to take it off (CLR). It's an acidic product so the OX would probably work too. I don't know if it's bad for the fiberglass though. Probably would be a good idea to ask a boat expert before attacking it.
    I tried straight CLR Chris and I swear the slime just giggled at me. The CLR didn't faze this crap. Glad I spent the $16.50 on the Hull cleaner product. The OX product worked great, after several applications.

    Thanks to all for your suggestions.

  11. #11
    Cleaning with Aloha Graduate Student ckingclean's Avatar
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    Wow, nice work! That thing looks brand new. My boat didn't look nearly like that!
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  12. #12
    Member 5000 PLUS POSTER Larry Millette's Avatar
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    Jim,,,NICE work on that boat. Damn if that thing doesn't look brand new now. Great Job!!!
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  13. #13
    Member Honorary Professor Grime Busters, LLC's Avatar
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    I tried to up sell a wash and wax. Not like the owner didn't have the $$$, just didn't see the need, since he is selling the boat. Actually the buyer stopped by to check out the boat about 1/2 hour before we were done.

    The worst past of this job was having to lay underneath it to get the parts of the hull that were otherwise not accessible.

  14. #14
    Member Associate Professor Pat Norman's Avatar
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    Dang Jim you did TOO good a job! That's why the owner did not want the wax job. I swear it looks like you waxed and buffed it. I got my boat out of storage this afternoon and cleaned it with Oxalic (F8), man it did work great. I wish I would have made before pics. We keep it in the water all summer and man it gets a nasty stain on it! I washed !st with housewash, then did the oxalic like you said, then rinsed, all with 30 orifice nozzles so pressure was kept low never used high pressure at all. I did use a little Dawn with the ox to help it stick a while. The ox really took off a lot of the chalky/oxidized parts too and it looks great.
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  15. #15
    Member Honorary Professor Grime Busters, LLC's Avatar
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    Quote Originally Posted by Pat Norman View Post
    Dang Jim you did TOO good a job! That's why the owner did not want the wax job. I swear it looks like you waxed and buffed it. I got my boat out of storage this afternoon and cleaned it with Oxalic (F8), man it did work great. I wish I would have made before pics. We keep it in the water all summer and man it gets a nasty stain on it! I washed !st with housewash, then did the oxalic like you said, then rinsed, all with 30 orifice nozzles so pressure was kept low never used high pressure at all. I did use a little Dawn with the ox to help it stick a while. The ox really took off a lot of the chalky/oxidized parts too and it looks great.
    It's a good idea to give the hull a good wax job once a year, especially after a harse, acid wash. It is imperative to protect the clear coat on the gel coat. Once the clear coat deteriorates, the gel caot will start cracking and failing.

    A good quality car wax will do. A carnuba wax will help remove most of the oxidation, if any. If no oxidation is present, I like the Turtle Wax ICE product.

  16. #16
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  17. #17
    Member Senior Undergraduate Dan Manley's Avatar
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    Nice Job!

    I just washed my boat this weekend, been sitting on the side of my house for a couple months....nothing too crazy, just your typical mold & algae much like on a house wash, DS house wash mix and watched the mold disapear, looks brand new again

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