Today's noon my family went to a restaurant.By the way,it's really an ideal one during holidays.on the way back,father's car passed a bus stop and I saw a cleaner was cleaning the ads. sticking on the bus stop wall,it's obviously a tough task and it took time for the guy who was cleaning it,moreover,it seems impossible for him to clean it up because of the remainders of the glue.It's no doubt that in China there are different kinds of ads. pasted on the walls,on the ground,on the street posts,or even on or under the overpasses.And the advertisements can be about everything---applications for jobs,venereal diseases,personal detective,or some sex trades.

 

So are there any machines or tools for the cleaners which can clean up the ads automatically?I think yes,and it's necessary for someone to invent one for them,or let's say,for the enviornment.After roughly thinking about this,I think there are three parts are needed for the machine:brushes connected with a motor,water gun,and the paper collector.The general shape can be the carrying of the "insects killer"---with a metal box and a insecticide shooting gun.OK,be more specific,the metal box can be a store of detergent and the remainder of ads,of course divided into two parts.And I think a motor need to be combined with this.The gun is a little bit complicated,three parts:brushes,detergent coming out points,kind of ads collecting machine(can be the same principle as dust catcher).A little bit confusing about how to combining them together?Let me try to analysis and explain it in detail---

▲Brushes:

First the area of the brush part should be larger than any kinds of ads outside,so according to my memory,A4 paper large is enough.Being of great difficulty is the different surfaces the ads pasted on---like on the wall is flat,while on the street posts is bent,round surface.It made me think of a special thing,razors,some of them can fit the shape of the face automatically.So we can also make the A4 large cleaner into three parts,which can be bent or flatted(I'm not sure fixed of not) depending on where it's cleaning.Secondly I think the hardness of the brushes should be taken into consideration because some of the surfaces be cleaned is make of plastic,which means if our brush is too hard it'll left some uncomfortable marks.We'd better collect the information about the surface meterials testing their stand-most hardness of brushes.(The picture followed is one of the examples for plastic one.)

▲Detergent gun: