Good Battery Operated Portable Cleaner

[fiestalux]

As I am in a shared garage with no water or power supply I need to buy a portable cleaner. I did think about using a local automated car wash but one colleague had his Skoda's paintwork badly damaged. Anyway can anyone recommend a good one? Preferably one which can also take shampoo/detergent although good water only ones can be considered.

Using 100ms of extension cables is not an option hence why it should be mobile.

[StevenST13]

The best ones out there are the mobi pressure washers they can run on mains, 12v or rechargeable batteries. I don't think they take detergent but u can buy hand pump sprayers for that on eBay for a couple of quid.