GR translation: in lonely Thesean brushings

[Mike Jing]

V141.28-32, P144.5-10   As his luck has always known, his subcortical,
brute luck, his gift of survival while other and better men are
snatched away into Death, here’s the door, one he’s imagined so often
in lonely Thesean brushings down his polished corridors of years: an
exit out of the orthodox-Pavlovian, showing him vistas of Norrmalm,
Södermalm, Deer Park and Old City. . . .

What does "brushings" mean here?
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Pynchon-l / http://www.waste.org/mail/?list=pynchon-l