Thanx

I did find décrottoir but not in Goggle traduction. (Well maybe now, if they listened).

And looking at the contributions above, I would interpret décrottoir as "mud remover" - in my extremely poor Franglais.

Just to give this a context; I have a page of the ironwork on buildings showing English ones in my Ville as part of a project to document the place in 2017. And "cure-bottes" are disappearing slowly so in my wanderings I photograph them generally, a dedicated website will follow.

During our week of danse Française (et l'Europe) near Moulins/Auvergne we did the touriste thing and just away from the cobbled streets I snapped a few "gratte-pieds". As you do.