Oh, I did that not long ago. Ie - I had it done, I didn't do it myself.
A garage not far from here had a special offer - a total cleaning inside and out for 50 dollars!
When he saw my car he just shook his head - i haven't cleaned for 4 years.....
He had to do some extra cleaning to get the outside clean so I had to pay a little more, but it was totally worth it!
Now I can almost see my own reflection in the car paint!