The $3,400 Lesson I Learned About Putting Off Exterior Cleaning Five years. That's how long I went without washing my house. I kept telling myself it didn't look *that* bad. The siding had some green streaks, sure, but nothing worth spending money on. Besides, I had more important things to fix — leaky faucets, worn carpet, that wobbly deck railing. Turns out, I was making the biggest...