You could use present perfect (We have washed the car...) if the car were clean. We can use present perfect if we still see the result of the action. But in this situation as a result the car got dirty again, so the result of washing disappeared. Better to use past simple.

The best place that I have visited is National Park Torres de Paine. I loved this place because I could watch amazing landscapes and I took some pictures of course. I visited that place on my vacation in 2020 with my mother, and my cousin’s family. We had an opportunity to go to the base of Torres which is one of the wonders of the world. When I was in this incredible place, I was impressed! I had never seen a better land before, the base had a turquoise lake and four big, thin and large mountains and when I climbed to the top I could see the snow. The disadvantage of the trekking was the distance because we walked six hours for going mountains and coming back. When we were close to the finish of the trip, suddenly a cougar appeared. My mother and my cousin were so nervous and they returned but I didn’t lose the opportunity to take a nice photograph!

What I did was to do cardio workout as much as possible. I do housework as exercise. I eat more veggies, less rice and less sugar. 😄

Have a good day. My name is Paul. I live in Philippines. Anyway, I downloaded this app because I wanted to learn speaking English.