Thanks Hawkeye, um...
1. possible/probable
2. not sure- using boiling water and bleach dash of standard disinfectant/
3. not sure what humidity should be/is, havent got gauge but dont think stability/temp is prob
4. very unlikly dont use any of those, could frshly mown grass be it? i.e. 2 stroke residue? dont remember having him on it just after mowing but, normaly after a week when its grown nice and soft.