How to clean print

There are ink smears when I print envelopes. I tried the cleaning options from the manual, but they did not fix the problem. Should I, can I, feed the envelopes from the front tray rather than the back?

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์ข‹์€ ์งˆ๋ฌธ์ž…๋‹ˆ๊นŒ?

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