I'll be tackling the grouting soon on the floor tiles i laid.. these are all 300mm ans have a slight bevelled edge. before i get stuck in, how easy is it keeping the grout to the bottom of that bevel.. whats the best way to achieve that.. do you get it there with the sponge wipes, or will the flex in a squeegee help that? Or is it just a mare and you have to rub all the edges down gradually until it looks right?