Plenty of creams, lotions and liquids out there. You will find everyone has their favourite. Do a search on here or ebay for black streak removal. Whatever you chose there will be some elbow grease needed.
My favourite is Fenwicks.
What you will need to do is treat it after cleaning - wax or whatever. Again loads of choice. I use a ceramic coating that is a simple wipe on, but each to their own.
Aldi black streak remover works pretty well. I also when bored in lockdown last year cleaned the whole van then did it with liquid diamond polymeresealant it was a bottle I think I've had for about 20 years!. It now cleans really easily so I would recommend a good clean then some sort of polymer sealant I think most cleaning product makers do one Autoglym do and I've got some but thought I would use the old stuff up and it's worked a treat.
Autoglym caravan & motorhome cleaner is very good. If some faded black streaks remain, then super resin polish will get them gone and sorted as mentioned above by Martin funflair.
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