• duryaśaḥ — infamy, bad reputation
  Compound: duḥ (bad) + yaśas (fame). The opposite of yaśas, which the Bhāgavatam treats as one of Bhagavān's six aiśvaryas. To smear yaśas is to attack svarūpa — and yet the Lord chooses to address it with feet and patience.
• liptam ātmani — smeared upon Himself
  Compound idea: lipta (smeared) + ātmani (upon Himself, locative). The poetics suggests dirt on a cloth. The Lord whose nature is pure does not pretend the smear isn't there — He goes to wash it.
• mārṣṭum — to clean away
  Infinitive of √mṛj, to wipe clean. The same family of words used in 40-42 (mṛjāmi). The chapter pivots on this verb — Kṛṣṇa cleans His own name; Satrājit must clean his.

Bhagavān could clear His name with a word — but He chooses the slow path: walk the actual forest, follow the actual hoof-prints. The Lord defends His glory by becoming a detective. Even His apologetics is līlā.