Cleaning Side Radiator

[bluwtr49]

For those of you with side radiators:

How often do you clean them.
How do you know if they need cleaning.
How do you clean then and how do you know if the come clean.

Since they draw air from the outside, one would think if it's dirty you could see it but I just don'e know. We have 95K miles and I have no idea if the PO cleaned it ore not.

Thanks for any insight.

[gbopp]

There are several articles available for cleaning radiators.
It's not just a side radiator issue.

Cleaning Radiator 1

Cleaning Radiator 2.

Use a bright flashlight to look for leaves, dirt and small creatures between the cooling fins.