ive had stuff taken from the car during car washes at various one off places, now that i use the same car wash every time they know me as a customer and i dont need to clear the car each time.In fact I cannot believe some of the Thai bashers here. I know Terry copped a bit of bad luck but those cases are quite rare and based upon my experiences.
theft from houses by workers and maids is common, just ask any thai about it. they know who to trust and not to trust and what precautions to take when strangers are in the house.