me personally i dont use straw or shaving after trying many things
what i use is course saw dust and there is a reason
when a hen lays an egg it is wet from the bloom and as the egg sits there the egg dries as it would d, which makes teh egg stick to what ever it touches and straw and shaving i have noticed are a nightmare to remove once dried on
course sawdust on the other hand rubs off with my finger real easy and its harly any on the egg to start with