Dirty marks on the rubber strips on the body joints

[GWAYGWAY]

I am wanting to remove the dirt from the these strips as they look distinctly tatty now. I have tried detergents and thinners etc but limited success was the result.
Has anybody got a better idea. As to what might be best to make them white again from blackish grey on the raised surfaces.
The glass fibre is losing its gloss now after 7 years now and that is requiring mechanical rubbing with compound, but that does not work well on the rubbers.

 

[number14]

Try oxalic acid on the GRP. It's a mild bleach used throughout the boating community. Used it on my own boat when I sailed. Available from eBay, of course!

TBH I would also use it on your rubber strip. Try a small patch first. Leave it on 5/10 mins, then wash off.

Apologies if you already know this, but go easy on the rubbing compound lest you rub away the gel coat on the GRP.

 

[maingate]

I used Elbow Grease. It works on black streaks as well.

For the bodywork, give it a really good wash then a polish with a good quality brand of polish.

 

[Wully]

I done mine today used that pink stuff needs a bit of work but great results on the plastics

 

[trevskoda]

Back to black or peanut butter oil.

 

[The laird]

Is it the rubber insets that go along the sides at shin height?on the last hymer I had 8 gave and bought new ones from brownhills sat them in hot water then squeezed into trim

 

[Scotia]

Try cleaning with neat TFR on a rag then back to black or similar.

 

[Robmac]

I always used Farecla on my boats;

Profile 350 Premium Liquid Compound

Profile 350 PREMIUM Liquid, an exceptional boat polish, efficiently eliminates sanding marks, rejuvenates gel coat surfaces, and achieves a superior high gloss finish. Especially effective on dark colours, this versatile product serves as a comprehensive one-step solution or can be integrated...

www.farecla.com

 

[GWAYGWAY]

Is it the rubber insets that go along the sides at shin height?on the last hymer I had 8 gave and bought new ones from brownhills sat them in hot water then squeezed into trim

No it is the inch wide strips that are covering the panel joint, especially the top at the roofline is is black along the length’

 

[GWAYGWAY]

I always used Farecla on my boats;

Profile 350 Premium Liquid Compound

Profile 350 PREMIUM Liquid, an exceptional boat polish, efficiently eliminates sanding marks, rejuvenates gel coat surfaces, and achieves a superior high gloss finish. Especially effective on dark colours, this versatile product serves as a comprehensive one-step solution or can be integrated...

www.farecla.com

It is rubber strips on the joints, not the fibreglass I am asking about.

 

[GWAYGWAY]

Back to black or peanut butter oil.

It is meant to be white .

 

[Robmac]

It is rubber strips on the joints, not the fibreglass I am asking about.

Yes but from your OP;

"The glass fibre is losing its gloss now after 7 years now and that is requiring mechanical rubbing with compound, but that does not work well on the rubbers"