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Old 06-23-2022, 06:26 PM   #1
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Seal Poop Stain Removal

Are there any knowledgeable chemists, or experienced boaters, with advice to offer? I'm in Port Orchard, Everett, WA. There is strong evidence that some homeless street harbor seals have had a homeless encampment on my transom. True to form, they left a mess. After scrubbing off the five piles of organic excrement, I have stain spots on my almond colored non-skid fiberglass transom platform. I don't begrudge the down and out homeless, but I wish they could learn to poop in the water, not where they sleep. These stains have resisted West Marine Boat Soap, Starbrite Non-Skid Deck Cleaner, Rustoleum Rust Stain Remover, and Simple Green cleaner. I have not yet tried vinegar, alcohol, paint thinner or lacquer thinner, the last two of which I don't want to wash into the environs of the unemployed homeless. Any/all advice will be appreciated. Thank you.
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Old 06-23-2022, 06:55 PM   #2
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I am not a seal expert, but it appears they also periodically regurgitate up the undigested fish bones and a mixture of fluids that are red in color. I have found these to be the nastiest to clean up. Have you tried a Magic Eraser?
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Old 06-23-2022, 08:30 PM   #3
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Try Davis Fiberglass Stain Remover. It may work. In the mean time maybe build some sort of physical barrier so they canít get up there. Besides the poop stains the weight may be too much for the swim platform.
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Old 06-23-2022, 09:18 PM   #4
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I don't have any suggestions for the stain beyond letting some Barkeepers' Friend on there for a while but for keeping the homeless under control perhaps try one of these.

https://www.sportsmansguide.com/prod...uaavz2ealw_wcb

They work pretty well down here in SoCal and as you all know we have more than our fare share of both types of homeless. Decoy only works with marine version as far as I know.
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Old 06-23-2022, 10:17 PM   #5
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I have a stain on my swim step because an otter killed and ate a seagull on it.
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Old 06-23-2022, 10:57 PM   #6
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Thank you, all sound like good suggestions, especially the decoy! I correct myself, I meant to say Port Gardner, not Port Orchard. I had not considered their weight, but that is a serious consideration. I have an electric scat mat at home to keep dogs off of furniture, I may give that a try also. I am a nature lover ... but even I have some limits. Nasty, nasty stuff.
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Old 06-23-2022, 11:50 PM   #7
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Hello Seal

Mark,

We have successfully used Zaal Noflex, the holding tank treatment, to remove these stains.

Non-official Instructions: Wet surface, sprinkle on the Noflex, go have a refreshment. Enjoy a snack. Do some chores. Hose it off. Second application if needed. It does not take muchÖsprinkle.

I would suspect your seal poop is similar to our prior seal poop, given our geographic proximity.

We use a line tied over the swim platform, in a zig zag pattern, to encourage the seals to chill somewhere else. Black and white, 3 strand and braided, are effective.
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Old 06-25-2022, 04:06 PM   #8
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Quote:
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I have a stain on my swim step because an otter killed and ate a seagull on it.
Man, almost seems worth it.
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Old 06-25-2022, 04:20 PM   #9
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Mary Kay - On and off.


Sounds sweet but it's nasty.
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Old 06-27-2022, 12:59 PM   #10
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Time and sunlight
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Old 07-01-2022, 12:40 PM   #11
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I would try Awesome from the dollar store.
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Old 07-01-2022, 12:42 PM   #12
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Quote:
Originally Posted by IRENE View Post
Mark,

We have successfully used Zaal Noflex, the holding tank treatment, to remove these stains.

Non-official Instructions: Wet surface, sprinkle on the Noflex, go have a refreshment. Enjoy a snack. Do some chores. Hose it off. Second application if needed. It does not take muchÖsprinkle.

I would suspect your seal poop is similar to our prior seal poop, given our geographic proximity.

We use a line tied over the swim platform, in a zig zag pattern, to encourage the seals to chill somewhere else. Black and white, 3 strand and braided, are effective.
Thanks I'm glad the Noflex worked for you . Can remember was it you that contacted me on this in the past or someone else . There was also one where their back deck had carpeting . Seal poop is nasty
Mr Noflex
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Old 07-01-2022, 01:08 PM   #13
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Davis FSR. will remove. This is a fiberglass remover. may need to repeat a few times. Don't let it sit too long and dry out . You Can get it at west marine
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Old 07-01-2022, 01:33 PM   #14
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As far as keeping them off in the future - we have found that the plastic chicken wire or plastic snow fence held of the the swim grid with shock cords work well when the boat is left unattended for awhile .
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Old 07-01-2022, 01:59 PM   #15
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I've used toilet bowl cleaner gel with bleach in it. Put it on, let it sit. It seems to lighten before your eyes. Scrubbing eventually helps more.
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Old 07-01-2022, 02:53 PM   #16
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Try scrubbing with Roll Off. Available at West Marine or was. Works pretty good on duck poop on our fiberglass swim platform.
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Old 07-01-2022, 03:14 PM   #17
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Don’t know if it matters but “Amazing “ is in its name. Local
Charter boat captain used to clean fiberglass cockpit after charter for lake trout and cleaning on board.
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Old 07-01-2022, 04:26 PM   #18
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Time & Sunlight

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Time and sunlight
Time and sunlight got rid of it for me.
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Old 07-01-2022, 04:54 PM   #19
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Quote:
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I've used toilet bowl cleaner gel with bleach in it. Put it on, let it sit. It seems to lighten before your eyes. Scrubbing eventually helps more.


I used to get the yellow moustache on my bow.
Lysol Toilet bowl cleaner, in Costco for real cheap, does this and much more. I have also used it on seagull poop, Otter poop, rust ( not the best ) and other stains. I have never had seal poop on my FG, and on the swim grid, the sea cleans everything off. Contains acid, so keep bare hands away.

I think Davis FSR is the same stuff, just packaged in smaller quantities and at a higher price, for the marine store.
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Old 07-01-2022, 05:40 PM   #20
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Oxalic Acid. Available at ACE hardware as wood bleach for less than $10. Granular. One canister will make a gallon or more. Or you can buy FSR, fiberglass stain remover in a pint jar for $20 in gel form at West Marine. This stuff is amazing. Apply new wax when complete.
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