Linseed oil was a substance used for the maintenance of cricket bats. When the newly-regenerated Fifth Doctor found a bat outside the TARDIS' cricket pitch, he immediately noted that it "could do with a drop of linseed oil". (TV: Castrovalva [+]Christopher H. Bidmead, Doctor Who season 19 (BBC1, 1982).)
Mang's workshop had bottles of linseed oil. (PROSE: The Immortals [+]Simon Guerrier, Short Trips: Past Tense (Short Trips, 2004).)