I did mine with T cut a couple of years ago (Don't know when it was done before that) it was quite grubby without a winter cover (must get it one this year)
Normally I just wash it now and again with some car washing stuff in the water.

So is Autoglym like t cut? i thought it was just a polish?

Roger, for me it needs a cut back to show it true potential, a dirty roof can ruin a Great Van. Not difficult o do but time consuming and you need good appropriate support! Easier with a machine.

Thought Autoglyn is a NON CUT polish too ! And as such could be used as much as you like ! If you have staines on the roof I'd advise careful use of a 'cutting
polish/or T Cut - then re Autoglyn then perhaps a gloss protector polish like Autoglyn 'Extra Protection Polish' I've always found Autoglyn products to be well worth the premium you pay !

We used the Starbrite Fiberglass Color Restorer first to clean the roof and 2 sides (we have an Eriba Future 430T, which also has 2 walls made of fibreglass), this works like a mild T-Cut. It will take a bit of elbow grease and only do small parts at a time.
We then used the Starbrite Premium Marine Polish with PTEF. This is a very thick cream and works better if kept in the warm before use. This is easy to put on and rub off. It also works very well with an electric polisher. Use sparingly and a 397gr tub should last 12-18monthsas its not cheap. Keith polishes the van 2-3 times a year and has not 'bloomed' yet.
Chris

Best of luck with whatever you finally choose to do, Roger. I'm in the same class as the 'bear' in that I allow the lady to grow old gracefully by giving her the odd wash and brush up - frequency dependent upon how dirty she got during the trip - with a roof polish every 3 years or so.
I spent the best part of two days last year applying Autoglym and then waxing only to note following our recent long trip to the Atlantic coast that my time would probably have been better spent decorating the front room and then watching the paint dry.

Two things that I have now discovered is that (a) the long protracted winter with the pop-up down tends to 'yellow' that section of roof that is not exposed to light whilst, (b) the exposed area of roof not covered by the pop-up roof fully retains it's bright white appearance with a clear border between the two areas. Along with that, and perhaps as a result of a different forming process/paint application, the pop-up itself tends to become ingrained with dirt far more easily which is far more difficult to remove despite the application of polish/wax. More worrying was the amount of tree sap that was dotted around the various roof sections which, if left to bake hard in the sun, would have been almost next to impossible to remove and which I have learned from bitter experience, can permanently damage any paint finish. Luckily the sap was still a bit on the soft side when I discovered it and a good rub using a bit of that computer screen cleaning stuff removed most of it.

We spend most of our time camping in various areas of France of which you also have accumulated a fair bit of experience, Roger. I'm sure you cannot have failed to notice that the French just get on with their camping enjoying the outdoor life and the opportunities/activities it offers. They are far less fussy when it comes to either car maintenance/polishing which also extends to their caravans and so long as things are in running order they tend to leave things alone. Perhaps it's a climate thing but the Brits appear to spend more time washing and polishing things than actually getting on and using them. This way of thinking also extends to the campsites themselves of course with the CC run sites being almost managed along military lines with all this nose in/nose out business whereas in France it's a case of 'here's your pitch, get on with it'.

In short then, accept that the lady is going to grow old so allow her to do so gracefully by applying the minimum of effort to keep her shipshape as you would do with the house and forget all about this polishing and waxing every five minutes which will only slowly remove paint over time no matter what product you use.

Cutting agent = removal of "dead" paint, oxidisation, tar spots, tree sap, staining etc

Polish = very mild cutting agent properties

Wax = protective coating after polish.

Sealant = longer lasting? Than wax, high tech newer solution.

In a nut shell, if your roof is "dull" then a cut back using T Cut or similar is needed, followed by a polish, followed by a wax or sealant! There aren't many older Eriba with a shiny roof and that's why! Because it's hard work and takes time! There is no quick fix magic solution, once done you'll get a season (without a cover) of ownership of a smart Eriba. I used to get laughed at for doing mine regularly but I was proud of the Eriba, I have posted quite a few hints tips photo's of the process. Hth 😎

I agree I would'nt use T cut to remove tar spots but if the rest of the roof needs a T Cut then it's hard to go around them!😎

I would'nt use a sealant either, I only mentioned it as if I did'nt someone else would of!😎

Totally agree with Elbow Grease! and it beats sitting on your rectal region watching Jeremy's Piles or Floosy Women

Apparently if you sing or hum while applying the wax it's known as "Waxing Lyrical"