You can get your budgie a different style of food container, one that has the top on with a smaller sized hole where only the budgie's head will fit in for feeding purposes and not nesting/sleeping.
In order to avoid rashes or irritation on the skin, it's best to gently wipe out the poop with a cotton ball soaked in lukewarm water. Keep on monitoring your new budgie and if he keeps on having his poops stuck on the vent even while perching, then booking an appointment at the avian vet for a check up would be the best thing to do, especially when there is discomfort/itchiness on the area due to a possible skin rash or inflammation.
Good luck with everything.
In order to avoid rashes or irritation on the skin, it's best to gently wipe out the poop with a cotton ball soaked in lukewarm water. Keep on monitoring your new budgie and if he keeps on having his poops stuck on the vent even while perching, then booking an appointment at the avian vet for a check up would be the best thing to do, especially when there is discomfort/itchiness on the area due to a possible skin rash or inflammation.
Good luck with everything.