Washing green algae off the roof

One problem with "comercial"including dealers washes is they all tend to use pressure washers, which on most LV s is not a good idea,  In a lot of areas there seems to be  a lot of hand  car wash sites run by eastern European  staff, if there is one near you ,see if they will do it ,we have one near us that we have seen caravans and motor caravans being cleaned and they did not seem to be useing any pressure washers 

We are very lucky as where we store our caravan, CC storage site there is a company  who will come to storage and do several a day on the wash down facility they never use a pressure wash and use zip up staging to access the roofs of the LV s, last year was £45 for a full hand wash and wax

There are what are I think called roof cap type covers that are just for the roof area that may also be able to be used various  length vans

There are caravan/MH valeters around, Ional, but I’d beware of the Sergei folk as they, too, often use pressure washers and may not be aware of the delicate nature of sealant and caravan build quality. 

Do you park your van under trees, perhaps? Mild and wet, yes, but we've never suffered from an unduly green roof in various Devon/Cornwall locations during the last 47 years.

I'm in a similar position re. storage. After winter, I fill the aquaroll at home with 'hottish' clean water and armed with a 7 tread stepladder, empty bucket, shampoo and a vileda mop, I go to storage. Down there I fill bucket, add shampoo, and mop the roof, rinsing regularly in the bucket.

Doing it after rain makes the job easier as roof grime already softened. If the ground is uneven, take care and get your other half to steady the steps to avoid falling.

Filling the bucket from the heavy Aquaroll is the most difficult part as its heavy (also lifting it initially into the car)

£50 saved and all for an hours work!

Telescopic ladders , easy to transport  bit of pipe lagging to save scratches

My preferred method is the same as derekcyril. My steps slide to form a single ladder and the pipe lagging (with some duct tape around it) works really well. I invested in a battery operated pressure washer from Bosch and it works really well. Depending on your need, you can select the intensity of the pressure, although in truth it is nothing like a mains operated unit. Great for rinsing and general cleaning though. I also carry a garden sprayer with a pre-mix of car shampoo or similar and agitate with a long handled brush. 

Our drive slopes so the caravan sit with the back down and tilted to the offside, not excessively but enough to prevent water sitting on roof which seems to keep the roof very clean. I also use the yellow awning rail strip to prevent black marks on the offside.

Has anybody tried the Worx cordless pressure washer on caravan as not as high pressure as mains and would be good if no water at storage site and take containers full of water to use with it.

I also keep my caravan on a storage site but I’m very lucky that the site operator has installed a wash bay with running water, hose and long reach brush. (I use my own brush because the communal one gets left on the ground amongst the gravel!). The best feature of the wash bay is a raised platform about 1.5 metres high and 5 metres long complete with a safety rail. The caravan can be pulled alongside the platform and the roof is easily accessible using the long reach brush. What’s even better is that there is no extra charge for using this facility, although it’s closed over the coldest winter months due to the possibility of freezing.

Thanks everyone! GeordieBiker seems to have found a perfect storage option!

Have garden sprayer now, fine on sides, will attack roof via ladder when spring really arrives!