What is your tried way of cleaning vinyl siding?

We having vinyl siding in which it is shaded until about 3 in the afternoon. Just wondering what anyone has used to clean theirs and does bleach work or will it dry out the siding?

My house has metal siding I tried using a stud finder by Stanley but it did not work well.

My house has metal siding I tried using a stud finder by Stanley but it did not work well.
I also have had problem using it on insulation foam board with metal on the back side.
What brand and model stud finder could solve my problem