against the passage of dirt for instance if the skirt is made of cloth or thin plastic sheeting it may be stiffened by incorporating internal supporting structures into the skirt such as bendable metal supports in the same fashion as the fabric of an umbrella is supported by an internal skeleton the skirt 24 is releasibly disposed around the workpiece 10 using closure means 26 the closure means can be any suitable means for releasibly affixing the skirt about the area to be cleaned and includes without limitation buttons snaps adhesives hooks and eyes and hook and eye type closures such as u201c velcro u201d brand closures the nature of the closure means is not critical to the operation of the invention so long as the means chosen reliably seals the skirt 24 about the workpiece 10 vacuum means 12 are provided the vacuum means includes an exhaust port 12 a and an intake port 12 b the direction of air displacement being indicated by the arrows in fig1 the vacuum means hereinafter referred to simply as the vacuum can be any type of vacuum apparatus which provides an exhaust port which vents high pressure air i e air pressurized greater than ambient pressure to create a high pressure zone and an intake port wherein air pressure at the mouth of the intake port is less than ambient pressure to create a low pressure zone as shown in fig1 and.