If they do dry clean they will leave the van dry. If they do a wet clean ,which is more efficient, it may be a problem drying carpets and upholstery unless they are taken out of the van to dry. If they leave the van damp then you need to dry it as soon as you can or you may get mouldy seats or carpets. It needs air movement and warmth.
------------- Mister G
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A bit more info....I clean carpets and upholstery and have a caravan. Luckily all my carpets are removable as is the upholstery so I clean it in the house. I found that it is very effective to have the fabrics stain protected .it works very well and any spills come out easily. It also helps to slow down the wearing process as it puts a protective coat on the fabric. I tried it on my own stuff before selling it to customers.
It is best done from new or after a clean.
Sadly I could not do my cousins motor home because the fabrics were not removable and it would be hard to get them dry ..especially cushions etc which have foam under the fabric.
Before I removed my carpets for vinyl floor tiles I usually ended up wet vac'ing my carpet every time I returned from site. Wasn't an issue with damp as I just left the windows open for a day or two.