He's become lazy and doesn't really contribute to keeping the place clean and the tenant and his gf are trying to keep a nice house. 

Just charge them a cleaning fee when their lease ends.

Carpet will need to be replaced at some point, depending on the wear and tear of the tenants, probably every 5-10 or so years, Refinishing hardwoods can last up to 20 years, and are easy to clean and keep looking good.

I want to keep the park clean and inviting so fill it up quickly.

No home inspection report has come back clean... ever.

We used ozone generator and all other cleaning work.

She said she wanted all her move- in money deposit and cleaning fee.

Fast forward a couple months, one tenant has already moved out because of her, and a second one has just informed me that she will also be moving out.The tenant of concern is very kind to me upfront, pays on time and keeps the house clean, but I can tell she’s extremely manipulative and inconsiderate of others.

You also should perform a move out inspection once they have removed all personal property, rubbish, and completed cleaning.

STRs should have lots of margin, so you can absorb the ebbs and flows of them.By the way, you can self-manage your property without doing the cleaning etc. yourself - there's lots of tools to assist with that and all you need is a good, reliable cleaner, a handyman, and a system!