In the embodiment of FIG 6 the cleaning medium 100 includes polyisobutylene 120 that is disposed on {HEAD ~ the front surface} 108 of the substrate 102 and polyisobutylene 122 that is disposed in {TAIL ~ a cell} 124 that is open to front surface 108 
In the embodiment of FIG 6 the cleaning medium 100 includes polyisobutylene 120 that is disposed on { HEAD ~ the front surface } 108 of the substrate 102 and polyisobutylene 122 that is disposed in { TAIL ~ a cell } 124 that is open to front surface 108
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH