DD gets into everything. we are lucky to rent a house with a big garden and have landlords who dont really care what we do to it as they are going to flatten the plot and build on it when we eventually move out we now have a veg patch and she loves to dig in it! she gets so messy some days!! but loves it!
I think its so important for kids not to be over sterilised!! i remember kissing my cat as a child and having mouthfulls of fluff, eating some of the most horrible things and playing in some pretty yuck places and i dont think it does any harm, aslong as its not bad germ ridden, its fine, thats my thoughts anyway.