Green algae on boat bottom

Zee · 11-08-2004, 10:26 AM

I finally pulled the boat out of the water this weekend. All good things must come to an end. BUT, I now have a green slime on the bottom of my white boat. We have never had this problem in the three years we have had summer dockage. The first two years we were at Trexlers and this year we are at Pier 19. There must be a big difference with the nutrients in that part of the lake. Be that as it may, what can we use to clean the bottom? We tried orange cleaner and a stiff brush and a blue scotchbrite. Any other suggestions?

ahopper · 11-08-2004, 11:06 AM

Slimy Grimy is what you're looking for. It's a mild cleaning acid designed for removing growth from boat hulls. Just mix the powder with some hot water in a spray bottle, spray your hull, wait a couple minutes, and poof you can hose the algae off.

Zee · 11-08-2004, 11:56 AM

Any idea where I can buy it?

Tyler · 11-08-2004, 12:24 PM

Another good acid based cleaner is On & Off. Available at most any marine store. READ the precautions on the label such such as not getting it on the trailer etc... Great product.

searay220 · 11-08-2004, 02:44 PM

I don't recommend "On Off" it ate away my trailer.I covered really well but the acid solution found it's way on to the trailer and took off the galv finish.
I do recommend the Slimy Grimy that stuff works Great.I purchased some at Parker Marine in Alton Bay.

Zee · 11-08-2004, 03:28 PM

Thanks for the info on the Slimy Grimy. I had no idea my bottom was ready for mowing. Maybe I will get a few more MPH and MPG with a clean bottom. I'm sure when my boat was on plane it wasn't very pretty.

BroadHopper · 11-08-2004, 04:25 PM

I wax the bottom of my boat with Starbrite premium wax with teflon. It makes removing the algae a lot easier in the fall. If you remove the algae immediately after taking the boat out. It is a lot easier than waiting for it to dry.

Belmont Resident · 11-08-2004, 05:16 PM

Whenever you’re using a product that could harm anything that is in the area you’re working in, try hosing the area down with water first.. If your trailer is covered with water it will dilute anything that gets on it and save your finish.

Island-Ho · 11-09-2004, 12:21 PM

I have used Slimy Grimy for the past few years, but find it is not quite as easy as 'spray it on and hose it off'. Be prepared to use a sponge or brush to really be effective. It does a good job at softening the grime, but needs a little more help than just the hose to get it clean.

11-08-2004, 10:26 AM	#1
Zee Senior Member Join Date: Apr 2004 Location: Union Wharf, Tuftonboro Posts: 173 Thanks: 0 Thanked 5 Times in 1 Post	Green algae on boat bottom I finally pulled the boat out of the water this weekend. All good things must come to an end. BUT, I now have a green slime on the bottom of my white boat. We have never had this problem in the three years we have had summer dockage. The first two years we were at Trexlers and this year we are at Pier 19. There must be a big difference with the nutrients in that part of the lake. Be that as it may, what can we use to clean the bottom? We tried orange cleaner and a stiff brush and a blue scotchbrite. Any other suggestions?

11-08-2004, 11:06 AM	#2
ahopper Junior Member Join Date: Mar 2003 Posts: 10 Thanks: 0 Thanked 0 Times in 0 Posts	Slimy Grimy Slimy Grimy is what you're looking for. It's a mild cleaning acid designed for removing growth from boat hulls. Just mix the powder with some hot water in a spray bottle, spray your hull, wait a couple minutes, and poof you can hose the algae off.

11-08-2004, 12:24 PM	#4
Tyler Senior Member Join Date: Apr 2004 Posts: 123 Thanks: 19 Thanked 9 Times in 4 Posts	On & Off Another good acid based cleaner is On & Off. Available at most any marine store. READ the precautions on the label such such as not getting it on the trailer etc... Great product.

11-08-2004, 04:25 PM	#7
BroadHopper Senior Member Join Date: Oct 2004 Location: Laconia NH Posts: 5,570 Thanks: 3,205 Thanked 1,101 Times in 793 Posts	Preventive Maintenance I wax the bottom of my boat with Starbrite premium wax with teflon. It makes removing the algae a lot easier in the fall. If you remove the algae immediately after taking the boat out. It is a lot easier than waiting for it to dry.

11-08-2004, 05:16 PM	#8
Belmont Resident Senior Member Join Date: Apr 2004 Location: Belmont NH but prefer Jackman Maine Posts: 1,857 Thanks: 491 Thanked 410 Times in 251 Posts	Whenever you’re using a product that could harm anything that is in the area you’re working in, try hosing the area down with water first.. If your trailer is covered with water it will dilute anything that gets on it and save your finish. __________________ "better to have a short life that is full of what you like doing, then a long life spent in a miserable way.."

11-08-2004, 11:56 AM	#3
Zee Senior Member Join Date: Apr 2004 Location: Union Wharf, Tuftonboro Posts: 173 Thanks: 0 Thanked 5 Times in 1 Post	Any idea where I can buy it?

11-08-2004, 02:44 PM	#5
searay220 Senior Member Join Date: Sep 2004 Location: Reading Ma/ Alton NH Posts: 81 Thanks: 1 Thanked 5 Times in 3 Posts	I don't recommend "On Off" it ate away my trailer.I covered really well but the acid solution found it's way on to the trailer and took off the galv finish. I do recommend the Slimy Grimy that stuff works Great.I purchased some at Parker Marine in Alton Bay.

11-08-2004, 03:28 PM	#6
Zee Senior Member Join Date: Apr 2004 Location: Union Wharf, Tuftonboro Posts: 173 Thanks: 0 Thanked 5 Times in 1 Post	Thanks for the info on the Slimy Grimy. I had no idea my bottom was ready for mowing. Maybe I will get a few more MPH and MPG with a clean bottom. I'm sure when my boat was on plane it wasn't very pretty.

11-09-2004, 12:21 PM	#9
Island-Ho Senior Member Join Date: Apr 2004 Posts: 176 Thanks: 19 Thanked 14 Times in 11 Posts	Slimy Grimy I have used Slimy Grimy for the past few years, but find it is not quite as easy as 'spray it on and hose it off'. Be prepared to use a sponge or brush to really be effective. It does a good job at softening the grime, but needs a little more help than just the hose to get it clean.