Can I Evict My Tenant Because of this?

I have a couple of tenants renting out a townhouse I used to live in. They are nice, and they have paid rent on time every month. I never get noise complaints, etc. BUT, I have had to tell them to be sure to keep up with the weeds, and over the summer had to ask them to be sure there was a pathway in the garage, as it was covered with unpacked boxes. Last month, I had to enter the house, with notice, to look at a leaky window. The house was filthy. I just had to go to the basement, and there were clothes everywhere, half empty soda cans, a couple plates with stale food. I let it go, assuming it was just a bad month. Wrong. I had to go in again last week to look at the washer, and the basement was still the same. Went to the kitchen, and there were dirty dishes in the sink, crumbs all over the kitchen and living room floors. Papers everywhere. A pot on the stove with curdled mac and cheese. As I was leaving I spoke to me neighbour; she said while the tenants are nice, and quiet, over the summer, they rarely mowed their lawn. They left a baby pool outside the back gate to the house, full of dirty old water, until she asked them to empty it. They would have cookouts and leave the trash on the deck for days at a time.

Can I evict over this? Or can I even simply ask them to clean the house? And if I opt for the ladder, can I do random checks of the premises with notice?
The lease is a legal lease. I am worried about an infestation which is why it concerns me. The food left on plates in various rooms, left on the stove. I looked for evidence of roaches and droppings from rodents, but luckily didn't see any.