from 4 inches to 24 inches in width and from 4 inches to 16 inches in length in one embodiment scraping blades 110 and 120 are 8 inches in width by 8 inches in length in another embodiment scraping blades 110 and 120 are 12 inches in width by 8 inches in length in still another embodiment scraping blades 110 and 120 are 12 inches in width by 12 inches in length as mentioned above first and second scraping blades 110 and 120 respectively are comprised of a base and a plurality of fingers in certain embodiments the base and the corresponding plurality of fingers of a scraping blade are equal in length thus in one embodiment scraping blades 110 and 120 are 8 inches in length by 8 inches in width wherein the base of each of the blades is 4 inches in length and the corresponding fingers also are 4 inches in length in certain embodiments the base of a scraping blade is greater in length than its corresponding fingers and in other embodiments the fingers of a scraping blade are greater in length than their corresponding base the distance between the fingers of a scraping blade may be from one sixteenth of an inch to one fourth in one embodiment the distance between the fingers of scraping blades 110 and 120 is one eighth of an.