Some people say a bit of dishwashing detergent in water, other people say this has an adverse effect on the fabric. Laundry detergent would probably attract the same debate. What I have used before, would probably nice and gentle and worked quite well is normal bath soap. Wet a bar of it and using that or a soft brush should get out most of the stains. Now if you're spilling red wine or something like that on it would be a different story, but one would wonder why red wine and kite are coming into contact...

There was a 'beer spilt on kite incident' last year I recall though, not such a strange concept when you think about it.

you don't make friends with skidmarks, wash the kite

some people use bleach.
Makes your white lines super white

its just a bit of love stains.... dw about it

www.seabreeze.com.au/forums/topic.asp?TOPIC_ID=6372&SearchTerms=bleach

dont bother cleaning it, dirty kites fly just fine...

You realise you probably do more damge to it smashing it into the water and leaving on the beach than a whole years worth lying wet and sandy in its bag... a couple of marks get over it. Kites are meant to be punished.

presuming just like fabric that sope damages clothes(and yes it does) id presume it would have the same effect on kites, if you must clean it do it once and leave it acctully f$@# it not my kite clean it good and proper and post the results let us know