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yes i use it..no problems at all just dilute with warm water, sponge it on then rinse off.some black stubborn streaks i use it neat to remove them .

have fun 

mucky but the mastic in the joints is filthy and it annoys me intensely 

cream cleaner from the supermarket and a good toothbrush works well.

Colour coded wax (or any good old fashioned car wax) lifts the black marks off really well, almost no effort at all.  I give mine a good wash (roof aswell) to get rid of the road grime, then give her an all over coating of wax once or twice a year.  Waxing the roof is hard work, but seems to cut down on the black stuff that causes the streaks in the first place and therefore cuts the work in the long run.

The colour coded wax can be expensive, £10-15 in some places, but if you shop around in some of the cheapy shops, you can normally pick it up for £3-5 and one bottle normally does the van once or twice. 

I dont think the paint coating they give vans is any where near as good as cars, so s the vans get older, the paint on the roof seems to get slightly pitted, which then means the black marks seem to be more. 

Tony

 I wouldn't advise using a toothbrush or any other stiff brush for that matter because if it dislodges the mastic you could end up having water ingress leading to damp. I always use a paint brush of various sizes

only use a soft toothbrush and does no harm at all as you only need to do it once a year.once the dirt is ingrained into the mastic no amount of general watered down cleaner will shift it.ours gets cleaned each week.keeps me fit.i do not allow black streaks.i am more concerned about algae i think it eats into the sealer but have no way to prove it.

Quote: Originally posted by flip53 on 24/1/2011

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what was all that in another thread about Baileys voiding insurance if the "wrong" cleaner is used?????

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"Has anyone tried one of the so called sealant polishes where you leave your 'van with the company for a day while they clean it thoroughly and apply some type of sealing polish?"

Not on the van but I have had on my car for the last 20 months - it's really good, makes it very easy to clean.  However if it had been full price I wouldn't have paid, for £200 I thought I'd give it a go and I'm pleased I did.

We use "muc-off" (typing very carefully!) It is a silcone resin type polish. Puts a lovely shine on the van and seems to last well. They also do a spray cleaner you can use first.

It was recommended by the nice lady at Salop Caravans(Cosford). Its also good on cars too she says

Both our cars are done with the sealant (diamondbrite I think), it is good. Kia was done by the dealer and they gave us a maintenance kit with it. You just add some conserver to the wash abut once a month.

In the kit was another application kit (don't think it was meant to be there!) so I did my Saab with it-saved £200!!!