Just can't seem to get aluminum siding clean! What works?

Post date: 2019-09-13 09:37:37
Views: 136
I have very dirty aluminum siding on a house in the Midwest. I've tried many things, none work. Ideas?

I've tried:

* Pressure washer
* Simple Green
* Branded siding wash mixed w/bleach
* Trisodium Phosphate (TSP)

The last three I applied by dipping a scrub brush in and manually scrubbing. Doing this with Simple Green yields some cleaning, but when I look at the house from afar, I can see that it's still not that clean.

Any ideas?

Can't afford to repaint.
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