Removing Black Marks on Sealant

[andyelbac]

Just gave the MH only it's second spring wash and found that these marks, where the sealant seals the joint between cab and GRP roofline, can't be got rid of. I tried Silky cream but to no avail. Any ideas and also, how the hell do I reach the bits in the middle?

 

[Two on Tour]

Any ideas and also, how the hell do I reach the bits in the middle?

I can reach the middle of the top of our windscreen with my wheel step.

 

[Terry242]

I read on a thread only a few days ago where someone recommended thick shop bought bleach. They claimed that successful but recommended a little trial patch somewhere discreet.

Terry

 

[VXman]

Just gave the MH only it's second spring wash and found that these marks, where the sealant seals the joint between cab and GRP roofline, can't be got rid of. I tried Silky cream but to no avail. Any ideas and also, how the hell do I reach the bits in the middle?
View attachment 889350

Ah - good old Burstner! Mine was like this when I bought it brand new. I've used Vim, AutoGlym caravan and motorhome cleaner, various other items. Reduced it but have never got it completely clean. I used a white sealant pen to colour it over after cleaning it as much as I could. Still not perfect but better.

Reaching the middle - stepladder by the door then put one foot onto the van just below the screen and stretch!

 

[VXman]

I can reach the middle of the top of our windscreen with my wheel step.

View attachment 889355

That's cool - where did you get it?

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[andyelbac]

I can reach the middle of the top of our windscreen with my wheel step.

View attachment 889355

I like that!

 

[NicandJay]

I found black streak remover very good and a long handled brush or a microfiber cloth on the end of a broom handle.

 

[Two on Tour]

That's cool - where did you get it?

Its a Thule 232 Step Up and I bought mine secondhand off of eBay a few years back.
New one ain't cheap, but Laser do a cheaper version.

https://luxurycenter.co.uk/product/thule-step-up-wheel-step/

REMOVABLE TYRE SIDE STEP FOR COMMERCIAL VANS IDEAL FOR LOADING & REPAIR | eBay

Sturdy steel construction. You may be asked to sign in. LASER TOOLS BRAKE TOOLS Caliper Wind Back Rewind Tool Mixed 18 Pce SET. LASER TOOLS 1/4 DRIVE SOCKET SET INC. Anti Freeze Tester Testing Tool For Ethylene Glycol ANTIFREEZE.

www.ebay.co.uk

 

[Howard B]

I use bleach and a toothbrush to clean mine. Leave it for about 15-20 mins and rinse off. May take more than one go looking at your screen.

 

[BouncyBoatFolk]

Patio Magic, neat. Apply with a sponge or brush. Leave it to work nothing else needed. If impatient clean with a tooth brush whilst still wet, but this is less effective. I stand on the top of the front wheel, it's free
Mike.

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[Nigel Crompton]

Ouch!

 

[lebowski]

I use Bilt and Hamber Surfex TFR on mine, together with a detailing brush or soft toothbrush, it comes up really well.

 

[DT]

Our new Burstner also had black marks on the sealant I complained to our dealer who used brake cleaner. I have tried all manner of mild stuff to remove new patches to no avail so when sale time comes I will probably use a small amount of brake cleaner also.

 

[bigtwin]

Suzukikettle

 

[Howard B]

Our new Burstner also had black marks on the sealant I complained to our dealer who used brake cleaner. I have tried all manner of mild stuff to remove new patches to no avail so when sale time comes I will probably use a small amount of brake cleaner also.

We used to use it to remove paintwork. I wouldn't put it anywhere near my bodywork.

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[M-J]

Had similar on my last MH, a friend of mine that used to be a valeter including the contract for a local caravan/mh sales company swore by tfr, apply with a cloth to just the mastic and then wipe off. It worked a treat.

Stand on the front wheel to reach the middle at a stretch.

 

[Mark1965]

Just gave the MH only it's second spring wash and found that these marks, where the sealant seals the joint between cab and GRP roofline, can't be got rid of. I tried Silky cream but to no avail. Any ideas and also, how the hell do I reach the bits in the middle?
View attachment 889350

Just gave the MH only it's second spring wash and found that these marks, where the sealant seals the joint between cab and GRP roofline, can't be got rid of. I tried Silky cream but to no avail. Any ideas and also, how the hell do I reach the bits in the middle?
View attachment 889350

You could try some mould and mildew spray. I've used it before on a caravan years ago. Just spray it on and leave for 10 minutes.

 

[Roby2008]

Don't have a piccy but Mellerud Schimmel cleaner works well....

 

[Jewellbags]

White spirit works as does the silky polish (my preferred)

 

[steve69]

Neat Domestos bleach and a small paintbrush worked wonders on mine. Stains gone within seconds, rinse off with water.

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[pagey]

ok i get a piece of kitchen paper roll soak it in bleach push it onto the sealant and leave it say 2 hrs pull the paper out and hose it off ,, it was the only thing that worked on mine

 

[BouncyBoatFolk]

Ouch!
View attachment 889368

Allow me to sooth it better for you.

https://groceries.asda.com/product/outdoor-cleaners/patio-magic-concentrate/1000339333842?&cmpid=ppc-_-ghs-_--_-google-_--_-dskwid-_dc&s_kwcid=AL!11432!3!!!!x!!&gad_source=1&gclid=CjwKCAjw26KxBhBDEiwAu6KXt2LKKP_XQ2nntCyDPfUYKmEftJY6Q93Wy_6ryEhB29mDLsPv0uPDwxoCGzcQAvD_BwE&gclsrc=aw.ds

You only really need an egg cup full, but it can used on the vans roof as well, simply spray it on when it's dry and going to be dry for a day or two and then simply forget it.
Mike.

 

[andyelbac]

White spirit works as does the silky polish (my preferred)

Tried the Silky and didn't budge it.

 

[andyelbac]

Thanks for all the suggestions. Will be giving them all a go!

 

[Nigel Crompton]

Allow me to sooth it better for you.

https://groceries.asda.com/product/outdoor-cleaners/patio-magic-concentrate/1000339333842?&cmpid=ppc-_-ghs-_--_-google-_--_-dskwid-_dc&s_kwcid=AL!11432!3!!!!x!!&gad_source=1&gclid=CjwKCAjw26KxBhBDEiwAu6KXt2LKKP_XQ2nntCyDPfUYKmEftJY6Q93Wy_6ryEhB29mDLsPv0uPDwxoCGzcQAvD_BwE&gclsrc=aw.ds

You only really need an egg cup full, but it can used on the vans roof as well, simply spray it on when it's dry and going to be dry for a day or two and then simply forget it.
Mike.

No Asda on the Costa Calida ..

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[BouncyBoatFolk]

No Asda on the Costa Calida ..

Look for a propriety moss and algae killer in a garden centre, it'll do the same job.
Mike.

 

[scotjimland]

White spirit works as does the silky polish (my preferred)

ditto ..white spirit

 

[Vintage_Potter]

Ouch!
View attachment 889368

£4.65 per litre on Amazon UK

 

[stuartholmes]

ok i get a piece of kitchen paper roll soak it in bleach push it onto the sealant and leave it say 2 hrs pull the paper out and hose it off ,, it was the only thing that worked on mine

That's the best thing I ever did for black mould on the silicon around bath at home. I used pieces of toilet roll in neat domestos bleach pushed up against the mould to stop it drying out or dripping off before done it's job. Bit of a faff to install but leave half hour or so then rinse off & job done.

 

[Dunroamin]

Just gave the MH only itssecond spring wash and found that these marks, where the sealant seals the joint between cab and GRP roofline, can't be got rid of. I tried Silky cream but to no avail. Any ideas and also, how the hell do I reach the bits in the middle?
View attachment 889350

In my day job I am a handyman and experience the same issues with silicone sealant around baths. Try the thicker gel bleach brands and generously coat the affected silicone. You then need to cover it in kitchen roll or toilet paper folded a few times and also soaked in bleach as this will absorb the stain. Then apply some cling film to stop the bleach evaporating and leave overnight or longer if possible. This should remove the staining and if it doesn’t repeat the process.
Good luck…