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Discussion Starter · #1 ·
The back of my boat blacks up with exhaust and a hard water line.
Looking for recommendations on what to clean that off with and anyway to help prevent it. I can get it clean, with alot of work, just hoping for an easier suggestion.
It's clean and waxed in this pic
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Super Goon At Large
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Looks pretty dang clean to me :D :D
 

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I prevent it by putting a quick coat of wax on the transom every time I wash it. Then the soot wipes right off with soapy water. The tips are harder to keep clean. I was told to use vinegar so I bought some, haven't tried it yet.
 

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Discussion Starter · #4 ·
FA18Driver said:
Looks pretty dang clean to me :D :D
Thanks, but that's a whole lot of work... The rub rail in the back only comes clean with brake clean and with last weekend on it, it's not that clean now
 

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The Works toilet cleaner works outstanding on all of the SS. I keep It off the transom. Its 1 $ per large bottle. You won't believe how well it works!!!!

What CC said about the wax.
 

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The boat is running rich if that black soot accumulates on the transom.My boat does it too.

The only way to get that crap off and looking brand new is spray it with 409 and and wipe it down with Mr. Clean magic eraser.You'll be amazed how effortlessly and easy it is if you try this.

Works for me.

Oh,and the rub rail I use 409 with bleach sprayed on that magic eraser and just rub the rail down.Will not hurt gelcoat,wax or graphics.you'll be amazed.
 

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I have had luck with four products and they work best in this order:

1. Swipes Wipes
2. Greased Lighting cleaner (Wal*Mart)
3. Sno-Bowl toilet cleaner ( which does have a minor acidic base to it)
4. Simple Green

You can use straight Acetone on the white rubber portion ONLY of the rub rail. Dab a LITTLE on a rag, and only allow two fingers width of rag to touch only the white rubber portion as you walk around the boat. It will look brand new.

Curtis,
I am sorry we did not get to meet at SML last weekend. I am sure we passed each other several times on the water or at the dock. Congrats on your new boat.

Also, as the weather and water temps warm up, you should see the exhaust soot decrease. You should only be running 87 octane as well. Anything more in that engine is wasting money and causing extra soot. Its designed for 87.
 

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I am not suggesting this only asking. I spray pam on my back bumper and near the rear quarters so that the rubber and crap from the burn out box doesn't stick..actually wipes off real easy....could something like that help out here, at least above the water line??
 

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ammaddon said:
I am not suggesting this only asking. I spray pam on my back bumper and near the rear quarters so that the rubber and crap from the burn out box doesn't stick..actually wipes off real easy....could something like that help out here, at least above the water line??
You might want to be careful with that...
Could end up inventing a new artificial bait if you see alot of fish attracted to your new non-stick (and low calorie) transom :D
 

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Black streak remover is about the best and easiest there is.
Gotten @ West Marine or similar store. Swipe wipes are pretty good too.
 

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Simple green works good for me but it also strips the wax so you must rewax afterwards. I do this about every 2 weeks. I may expiriment with different waxes this year by doing half with one and half with a different brand to see which works the best. IMO if I can find the right wax the black chit should come off with soapy water instead of using a harsh chemical that strips the wax.
 

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Looks like you have a 525 efi motor. I had this happening to the back of my boat very bad and just had Mercury Racing reprogram my ecm's thru my certified Mercury mechanic. That has taken care of the problem. It was no cost, warranty. I did use Simple Green to remove it and it worked well.
 

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I used CLR last year and it works great on the tips. Spray and hose off and they are clean
 

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STIX said:
The Works toilet cleaner works outstanding on all of the SS. I keep It off the transom. Its 1 $ per large bottle. You won't believe how well it works!!!!

What CC said about the wax.
I spray the tips, transom, and scum line with the Works in a pump lawn chemical sprayer. I let it fizz, hit it with a brush if the stains are stubborn, and rinse well with water. Been doing it for years with no problems.

I use Bleach White spray for quick clean ups.

My 502 EFI soots the transom if I run anything with more than 87 octane. 87 doesn't do it as bad.
 

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Read in Power & Motoryacht magazine of all places in the maintenance tips section that simply placing a coat of wax on the transom and simply leaving it on while boating (out of sight anyway) then wiping it off once out is a great effort reduction tip for just such things. I have yet to apply the tip, but it sounds good on paper.
 

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Discussion Starter · #17 ·
Thanks ffor all the good suggestions, I will try a few to see what works best, then wax the hell out of it.

Sydwayz, yeah missed you.... Sure we did pass each other somewhere.

Perfect Sun, it's an older 500efi, but my older boat with a 502mpi did the same thing. Guess better rich than lean.
 

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Check the timing. They were famous for not being set right. It needs to be set at 1800 rpm @ 8 degrees. Make sure your getting full advance at 34 degrees. You need a merc scan tool or a timming plug to do it. Pressure regulators on these went bad alot too and will soot up transom.
 

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Discussion Starter · #19 ·
Thanks for the info on the timing. I'll have to check locally for a trustworthy tech.
The soot is not bad, where I think there is a problem. Seems normal to bigblock with thru hull exhaust.
Just hoping to save some cleaning time.
 
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