United doesn’t have to allocate anymore time to cleaning at KOA than any other station due to staff. And the ground staff you spoke to at KOA on the Island of Hawaii have worked at other stations to have very detailed knowledge of difference between cleaning crews? standard practice is not to board planes while they are being cleaned. After the cleaning crew departs, the FA go through the cabin to do a cabin/safety check - they can’t do it with passengers boarding. I guess you can cite many instances/airlines where it is. Your experience is not unique to a United. Every airline has passengers who say “I will never fly this route or airline again”. Southwestern left travelers stranded for days recently. More experienced travelers. The cleaners were dealing with a very short time period due to the late arrival of the plane, not because they were lazy. They are under pressure to turn the plan.

The real problems for your late arrival to the gate were 1) the late departure from SFO of your plane, 2) the long taxi at SFO on arrival, 3) the 15 minute wait for a gate. No need to smear cleaners based on hearsay. 1, 2, and 3 are facts.