I had a similar experience in a flexwing microlight once - making a precautionary landing in a promising looking field, I was rather disconcerted to discover that the owner had been "muck spreading". Friction was approximately zero, and the far end of the field was piled about 4ft high in the stuff.
I have never appreciated quite so much the benefits of a propeller at the back!
After fixing my problem, I flew out and home - where it took me about 90 minutes with a bucket and sponge to clean the aeroplane up - everything I was wearing went straight into the washing machine!
G