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?

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0