There was a thread on this a while ago and someone mentioned it wasn't sap but honeydew. See this
http://www.ukcampsite.co.uk/chatter/display_topic_threads.asp?ForumID=3&TopicID=150674&SearchPagePosition=1&search=sticky+tent&searchMode=allwords&searchIn=Topic&forum=3&searchSort=dateDESC&ReturnPage=Search
Hope this link works??
Don't forget to leave a review of all tents you've used, for a chance to win fantastic prizes
------------- Think this year is to follow old meet friends for 2014.
If you cant do someone a good turn,don`t do them a bad one,its nice to be nice you know,and little things mean much more later in life.
Pete.
On the Decathlon site the Quechua Tent instructions include:
'RESIN STAINS (very hard to remove): once the stain is dry, gently scratch it off whilst holding an ice cube on the inside of the fabric to make the resin brittle so it will come off more easily.'