Removing black streaks on a motorhome

[Morningside]

Exactly the same as title really. bd things will not go away. What is the best stuff to use?

[Morningside]

Thanks all and plenty of thoughts here. I never thought of somewhere like Aldi. But Autoglym seems to an idea.

Then again that cream cleaner looks good as well. AGGGGHHHH!!! Choices.

I am just glad someone has said do NOT use product x so it looks like most things work. I am always afraid of using cheaper stuff incase it kills the paintwork.

[Morningside]

AutoGlym seems to be coming out tops. Stupid question but what exactly are these streaks? I thought it was coming from the rubber but they appear everywhere.