このしみはふいても取れない。

this (something or someone close to the speaker (including the speaker), or ideas expressed by the speaker)

true bristletail (any insect of order Thysanura, esp. of family Lepismatidae); Oriental silverfish (Ctenolepisma villosa); someone who is unable to apply what they have read

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

to wipe; to dry

too; also; in addition; as well; (not) either (in a negative sentence); both A and B; A as well as B; neither A nor B (in a negative sentence); even; as much as; as many as; as far as; as long as; no less than; no fewer than; even if; even though; although; in spite of; further; more; again; another; the other

to come off; to be removed; (of pain, a fever, etc.) to disappear; to be caught; to be harvested; to be interpreted (as); to be taken as; (of balance, etc.) to be attained; to be obtainable